[Kunundrum]

I see you have the same problem I had with my eagle rods and CTR pistons.

you have 4 choices

1. sell the pistons buy new ones
2. sell the rods use OE
3. have the pistons machined to accept a c-clip
4. Fabricate a wrist pin retaining tool (like I did)

how I did it is I used a threaded rod, 4 nuts, 2 washers and some permanent thread lock.

cut the threaded rod to be 2mm (or less if possible) shorter then the pistons. you place 1 nut at each end at so they are flush with the opening of the wrist pin hole. place a large washer on the rod (may be needed to be trimmed to fit flush) and tighten with an other nut.

-n|n-------n|n-
this way the pressure is exerted on the nuts not the piston itself to bend it out of shape.

once everything is the right size assemble everything with permanent thread lock.

trim sharp edges with a file or small grinder and assemble as normal.