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  #1  
Old 06-01-2019, 5:30 PM
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Default P-64 Trigger Bar Crack

P-64 trigger bar crack

So I picked up a Polish P-64 at a local gun shop $179.99 but after disassembly I notice the crack. Google Fu shows a couple discussions on it and a surplus part site. Unfortunately, the site is out of stock and no telling if more will come into the country.

My initial thought after this was “If it breaks I’m screwed”. A few ideals like epoxy and welding came to mind, but then I may damage my only part. So what are the possibilities of manufacturing a copy? A CNC or 3D printer would be ideal but cost intensive. So would a lost wax cast be plausible?

I would have to make a silicon mold of the part, make a wax casting, and then a plaster mold. Then choose a substitute metal for steel. Brass, aluminum, etc. Finally, dermal, file and sand to fit. Labor intensive but possible with basic equipment.

Now the final product would be considered a sacrificial piece as to spare the original from eventually breaking. While the forms paint a picture of inevitable doom, YouTube videos of home jewelry making appears to be a light at the end of the tunnel.

So posting this address two hopes. The first is if anyone agrees or has a better option. The second is to see if anyone is willing to help, because I currently do not posses the equipment to do this.

I suppose I could see if a professional jeweler could repair the part or even create a copy for me. Or attempt it on my own documenting the journey for others in the same predicament.



061219

Made a rubber mold and a resin casting. Took a couple tries but seems promising. The plastic is too flexible so I'm thinking on adding a metal powder to the mix and ordering the wolff hammer spring pack. If I can get through a couple boxes of ammo before it fails, I will be satisfied until I can build a bucket foundry and pour aluminum bronze. I would even sell a few to cover my costs.





061919

Installed the Wolff 18lb reduced hammer spring and sanded down the part for fitting. The trigger bar does flex allowing the outer pin to slip, while the inner pin is bent upward by the trigger return spring. It did work once in single action mode. I'm going to try modifying the mold to extend the outer pin so it wont slip out of the trigger as the trigger bar flexes. Ultimately I need a stronger material such as aluminum, brass, or aluminum bronze... I need to build a bucket foundry. Or perhaps I can send a lost wax casting to someone who already has one.


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Old 06-02-2019, 8:09 PM
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Old 06-03-2019, 4:51 AM
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Have you checked on the P64 Resource site: http://www.p64resource.com/forum/? Someone over there may have a fix or parts.
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Old 06-03-2019, 8:05 AM
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If it's flat on one side, clamp both ends of the part to a piece of brass and weld it up.
Having it clamped keeps it from distorting during welding.
Temper it to about 800 degrees afterwards and it won't be brittle.
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Old 06-12-2019, 3:40 PM
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Updated see top
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Old 06-19-2019, 11:44 AM
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Updated see top
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Old 06-19-2019, 3:33 PM
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Quote:
Originally Posted by emptybottle151 View Post
Installed the Wolff 18lb reduced hammer spring and sanded down the part for fitting.
The trigger bar does flex allowing the outer pin to slip, while the inner pin is bent upward by the trigger return spring.

Ultimately I need a stronger material such as aluminum, brass, or aluminum bronze...
Or you could just weld the one you have and be done.
I know that's not nearly as exciting as re-inventing the lever though.
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Randall Rausch

AR work: www.ar15barrels.com
Bolt actions: www.700barrels.com
Foreign Semi Autos: www.akbarrels.com
Glock, XD and M&P pistols, Benelli and Remington shotguns: barrel, sight, trigger and receiver work.
Most work performed while-you-wait, evening and weekend appointments available.
Founding member of the CAPRC
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Old 06-19-2019, 3:39 PM
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Quote:
Originally Posted by ar15barrels View Post
Or you could just weld the one you have and be done.
I know that's not nearly as exciting as re-inventing the lever though.
I'm scared of damaging my only part...And I don't have a shop/garage or a welder. The pics show a coffee table in an apartment.
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Old 06-19-2019, 3:47 PM
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Quote:
Originally Posted by emptybottle151 View Post
I'm scared of damaging my only part.
Then have someone else with better skills weld it.
As already said, all you need to do is fixture it so it won't distort during welding.
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AR work: www.ar15barrels.com
Bolt actions: www.700barrels.com
Foreign Semi Autos: www.akbarrels.com
Glock, XD and M&P pistols, Benelli and Remington shotguns: barrel, sight, trigger and receiver work.
Most work performed while-you-wait, evening and weekend appointments available.
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