Wildcat Hammer

[Crusher]

Well this is something unexpected. I adjusted my HS to get the velocity down to 905 a couple of days ago. And to keep it from backing out I used a little of the vibratite stuff to keep it from backing out. It is really great stuff.
While shooting yesterday I noticed my accuracy was not the same. So I shot a few over the chrono and again, it was shooting 955. What? I removed the stock and checked the HS. Sure enough, it had moved forward !!! 
I put the thread lock on there to prevent it from backing out. But I never expected it would move FORWARD toward tighter. I don't even know how that happened. Anyone else ever have this happen? I mean, without the gunk in the threads, this HS turns very freely down to about 5 turns. I barely feel the spring until it hits about 6 turns, which is where I had it set.

Crusher

 

[Guest]

Maybe since the hammer is free floating (no tension on the hammer spring when uncocked) when the hammer is thrown forward the spring wants to move in that direction as well and with nothing holding it back I guess it could? That is weird I would expect it to back out also but there you have it lol.

 

[Guest]

This makes me think because when I bought a wildcat (used) and chronied it it was shooting like 980fps and the hammer spring was in too far The previous owner said he didn't own a chrony and he just shot it how it was. I bet the same thing had happened to him.

 

[Matt247365]

Crusher, you're making me wanna pull out the chrono! What you are describing has never happened to me ... so far.

Matt

 

[HighAltAir]

Did you let the vibratite dry good before installing the hammer spring adjuster. You can order another A37-6.35 #11541spring adjuster for 25cal, A37 #11030 for 177, 22 cal. Then use it as a jam screw to keep the inner one in place. I made a brass one with screw driver slot because that hex hole will strip easy. 
CH

 

[Boombots74]

Crusher

You just experienced my life bro. The oddest and strangest things will happen to me where people think I make it up or have a drinking problem. Haha. I have no answer as to why the spring went forward, not even going to try to explain it. 

On a side note. That's pretty hot for a wildcat. I've had 5 .25 Wildcats between me and friends that shoot with me. All were about 850 fps with the 25g JSB. What pellet and weight are you using to get 955? And what is your regulator set at?

 

[Crusher]

Boom, Sorry didn't mention. I'm talking about a 177 with JSB 10's. Everyone wishes they could make the 25 shoot at 955. LOL

HighAltAir, Yeah I let it dry for like 10 minutes. But I put a little on the nut but mostly BEHIND the nut to keep it from backing out. That worked It went forward instead. I had no idea it would move against the spring tension.

Matt, I put a mark on the nut with a felt tip marker once I had it in place. I put it straight up 12. When I took the stock off I could see it had moved to around 4. ? HOW?? 

Ok, just thought I'd ask. I haven't seen this happen before and would have doubted that it would. But..... 

 

[Rj]

Not on a wildcat....but had good luck keeping a few adjustment screws stay put with a few wraps of wax dental floss on the threads. May be worth a try.

 

[Crusher]

Well I think the problem is that I had absolutely no idea the hammer would work its way forward. That is toward the spring tension. So what I did with the VC3 Vibra-tite was to keep it from backing out. So that part worked just fine. It didn't back out So I think what I will do on the next clean and assemble is to apply the vibra-tite to the to the threads in front of the nut too. That way it can't go either way. 
If you haven't tried it, check out Loctite VC3 Vibra-tite online. I found this stuf about 4 or 5 years ago while learning to adjust my first PCP. It works great. It doesn't get hard like regular loctite. And the best part is that it will allow you to adjust something and then still keep it right there. 

Crusher

 

[dirtbikerick]

I'm guessing that when the hammer drops the spring twists and being under tension until relaxed it rotates clockwise. Hey highaltair, what thread pitch are the jam nuts you used, I had been thinking the exact same thing, I pulled mine tonight and I'll take it to work tomorrow to measure, it looks like 14 x 1.0 mm pitch.

 

[Rj]

I don't know if the breach blocks are the same? But the streamline is 16x1mm.

 

[Crusher]

I thought about that a while back and that may be a good solution. If I just get another nut just like the one that is in there and jam it against the other, it may prevent it moving in either direction if it is in a bind with the second nut. Once I get the Huma installed, I think I'm going to give that a try.

 

[dirtbikerick]

I measured it out, It is 16 x 1.0 mm, Matt USA needs to get on fabbing these up!

 

[HighAltAir]

What you can do is get a 16x1 all thread cut a piece and hacksaw flat blade screw driver slot. And you have a jam screw.
CH

 

[dirtbikerick]

I think you will also need a air vent hole, I looked online and did not see any 16x1 bolts, I did not look very deep.

 

[HighAltAir]

"dirtbikerick"I think you will also need a air vent hole, I looked online and did not see any 16x1 bolts, I did not look very deep.

Why would you need an air bleed hole? Do you have a large air leak into the breech block? The holes next to the the hammer/spring adjuster hole are all open to each other. Plus the breach block is open for the trigger and sear. That area should not be pressureized. I have not looked lately but I have a die and brass rod that I made mine from I just figured you could buy 16mmx1.0 thread bolts or all thread.
CH

 

[Guest]

Would it be possible to purchase one of these - https://www.ebay.com/i/222718924311?chn=ps&fl=a - and make threads on a piece of metal or plastic rod? 

 

[hollowpoint]

"CHUCK"Would it be possible to purchase one of these - https://www.ebay.com/i/222718924311?chn=ps&fl=a - and make threads on a piece of metal or plastic rod?

Theoretically yes, but you might need access to a lathe if you need to turn down the OD of the metal roundstock before running the die through it.

 

[Guest]

Well 16 mm = .62992"....so why not take a piece of 11/16" rod (.6875") and use the M16x1 die to cut threads on it? After all the difference between 16 mm (.62992") and 11/16 (.6875") is only .05758...I don't know anything about cutting threads on something, so that may be an easy job for a die or an impossible amount of material to remove by hand. We need HighAltAir to answer this question please...

 

[Kitplanenut]

I'll try spinning some out on the lathe this afternoon. What do you think. Steel, brass or high density plastic? This new .177 Wildcat I just received is really cooking. Average 978 fps with the 10 grain JSB''s. Accuracy is ----Ok, but it's a brand new gun shooting to hot. I'm really wanting to start tuning but keep telling myself to give it a tin of pellets to settle in first. On the jam nut was thinking about drilling two holes and then filing the center down on a large screwdriver blade to make a two prong adjuster tool. Any other ideas? Sylvan