Impact disassembly question for Gen 1

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Drumsnguns

Member
Jun 14, 2016
961
22
North Carolina, United States
I have an Impact from Oct. 2016 which makes it a Gen 1. But maybe it’s a Gen 2. Anyway it has a slow leak and I’m disassembling to replace all the o-rings. 
I've run into a problem at the valve assembly. I watched the master class video where Ernest uses modified vice grips to remove the hammer stop by unscrewing it. 
On mine it looks like a 1.0 or maybe even a 0.5 mm Allen grub screw holding it. My 1.5 mm won’t fit it.
so two questions

Is really a grub screw and

What size of a it?

Thanks for the help

KP/NC


 
Yeah I was able to mic it and my reading came close to 1mm. I did find it in the FX schematic. I’ll have to order some smaller Wiha Allen’s. 
I’ll probably order the C3 Delrin stop ring and a new valve seat from FX. Hoping they are selling the stronger valve seat Ernest created. Has anyone replaced their’s who can verify that the replacement is stronger?

Thanks again
 
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That's weird one has the grub and one doesn't....there is a grub screw in the schematic on the FX support page for older Impacts. It's so small I'll have to recheck when I get home from work to see if there's actually one in there.

I don't have a torch but I do have a heat gun.

I just found the video that does confirm the size of the hammer seat grub as 1.0 mm

https://www.youtube.com/watch?v=y1eaUg4MPMQ

Well, in the video that followed after the one above Ernest states that he has seen some that have the hole but no set screw.....so...gonna check carefully before I start ordering 1 mm keys from Europe.



KP 
 
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"Well, in the video that followed after the one above Ernest states that he has seen some that have the hole but no set screw…..so…gonna check carefully before I start ordering 1 mm keys from Europe."

I see you're in North Carolina. The Harbor Freight allen key sets all have 1.0mm hex keys in them and are very affordable. I got mine from Harbor Freight in Charlotte.

HTH




 
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I checked with the Harbor Freight website and none of their sets had a 1.0 mm key. Wish I’d seen your post and gone down to the HF here in G’boro. 
Seems the moment I give up and pull the trigger, this happens. Haha. Thanks for all the input guys. Might go and have a look at the store here today. Guess then I’ll own a cheap 1.0 and a real expensive 1.0🙄🙄🙄
 
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