Huben GK1 trigger parts broken - how to get out the blind pins?

[airman_o]

hi guys,

Yesterday I was plinking with my Huben GK1, and suddenly I heard a soft click when I squeezed the trigger. The gun didn't fire and I couldn't get it on safety.
So I opened the rear end, dumped the air. After much trying I gradually disassembled the gun and in the end I found out that two parts of the trigger mechanism are broken (metal parts that are broken). It's part 29 and 32 in the linked drawing, and a bent spring (part 31).

I advanced quite well with the disassembly, but I'm stuck now: the trigger mechanism is fixated by metal pins, but those are blind (one sided) with a plastic seal on it. I drilled the plastic seal out, but now I'm stuck: does someone know how to get the blind pins out? Internet sources told me to either drill the metal pin, or try to attach something else with superglue. But isn't there a better way?

 

[Sergey1972]

hi guys,

Yesterday I was plinking with my Huben GK1, and suddenly I heard a soft click when I squeezed the trigger. The gun didn't fire and I couldn't get it on safety.
So I opened the rear end, dumped the air. After much trying I gradually disassembled the gun and in the end I found out that two parts of the trigger mechanism are broken (metal parts that are broken). It's part 29 and 32 in the linked drawing, and a bent spring (part 31).

I advanced quite well with the disassembly, but I'm stuck now: the trigger mechanism is fixated by metal pins, but those are blind (one sided) with a plastic seal on it. I drilled the plastic seal out, but now I'm stuck: does someone know how to get the blind pins out? Internet sources told me to either drill the metal pin, or try to attach something else with superglue. But isn't there a better way?

Plastic or wood cutting board. Pound receiver on the board, see if pins drop. Depends on how tight they are. Use of plastic plugs implies they may be slip fit. Pounding reciever on table may make them move.

 

[airman_o]

Plastic or wood cutting board. Pound receiver on the board, see if pins drop. Depends on how tight they are. Use of plastic plugs implies they may be slip fit. Pounding reciever on table may make them move.

Thanks, it's a good suggestion that's what I thought as well. But I already tried tapping on the opposite side of the receiver with a hammer (protected by a rubber sheet of course) to get it out, but it doesn't move unfortunately/

 

[Pale_Rider]

The plastic plugs will not come out by tapping the receiver. I have done this once before and I had to use a drill press. Here’s the video showing how to do it:

(Plug removal starts at 2:31)

*he uses a compressor to blow out the pins. If you don’t have one you can buy a strong magnet ($10) to remove them.

 

[airman_o]

thanks a lot @Pale_Rider , that's exactly what I need Except for the part that I don't have a drill press. If there's no other 'smart' solution I guess I'll have to buy one to revive my GK1 ...
and I guess blowing out the pins can also be done with a 300 bar bottle?

 

[Pale_Rider]

thanks a lot @Pale_Rider , that's exactly what I need Except for the part that I don't have a drill press. If there's no other 'smart' solution I guess I'll have to buy one to revive my GK1 ...
and I guess blowing out the pins can also be done with a 300 bar bottle?

Amazon sells a $40 mini drill press. It might not be good for drilling through metal but it should be able to handle drilling into some plastic plugs.

The 300 bar bottle should work. You might need a nozzle to concentrate the blast on the pin. I had a giant magnet laying on my work desk so that’s what I used.

 

[airman_o]

well the plastic plug is already out, I used my dremel for that. Maybe I should try to give it a go with a metal drill as well.
I could indeed buy a drill press, but the airgun money pit is going a little fast so I try to stick to the essentials.

 

[Pale_Rider]

well the plastic plug is already out, I used my dremel for that. Maybe I should try to give it a go with a metal drill as well.
I could indeed buy a drill press, but the airgun money pit is going a little fast so I try to stick to the essentials.

Do you have the drill press attachment for the dremel or did you freehand it? If you free handed please share a pic of your work. I’m curious to see how you did.

 

[airman_o]

I don't have the drill press attachment, so I freehanded indeed. With the plastic plug it's rather easy, but freehanding won't work on metal I'm afraid.

 

[Sergey1972]

I don't have the drill press attachment, so I freehanded indeed. With the plastic plug it's rather easy, but freehanding won't work on metal I'm afraid.

If you "peened" the hole pins will stick. If the pin hole is not flat bottom and you push on them, they will stick in the drill point at bottom of hole. Hitting with plastic malett should be on the open side (moves reciever and pins stay, just like banging on table should be the open side to make pins drop).