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Hi I`m using full floating rods with Honda P29 pistons but the pistons does not have provision for circlips, I found after some research that machining grooves on the P29 piston weakens too much the piston. So I though: PTFE buttons, right? Wrong, I tought on an alternative aproach to secure the wrist piston in place: Drill 2 holes in the piston, tap the holes, put a machined headless allen bolt. I`m still deciding if I`m going to tack weld the hole after fastening the bolts with a TIG welder, just to be sure that the bolts won`t come off.

Here is some picture of the actual piston NPR Honda P29 75.5mm Piston:


Here is a sketch of the piston and the bolts that secure the pin in place:





and here is the play i need so I can place the holes in the right position: Is the play between
the pin and the circlips. It can be from any full floating car piston, I need just the ball park area.

 

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sounds like a decent idea, but I'd be too worried about piston skirt integrity as well as the expansion rate of the allen screws. Undoubtly you'll be using a grade 8 or whatever type material for that job, what about the threads on the screw? Do you think or would it be possible for the threads to put more un-wanted wear to the edges of the pin?
 

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1mm or less should be ok. Nice solution(and pics!) though, but I'm a bit worried about those screws coming loose.. Maybe the tack-welding would work.
 
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