D's HPI twin build

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It seems like the rc GODS ??? are testing my grit every step of the way?
Check this out?
In the pic are the original crank (rmck)
And the one that was sent straight from Korea ? now here is the the thing??
The small end of the con rod is not the same size ? View attachment 59043View attachment 59042
WTF ??‍♂️ In the small end there is a roller bearing and X2 retainer washers that go on the inside of the piston.....like so ??View attachment 59044View attachment 59045
So when I put it all together and put on the piston it's such a tight fit ? ......so iv done this to one side now onto the next one ??View attachment 59046
Iv sanded to two washers with oiled 600 grit paper to get it all to fit with enough movement for it to work properly ????
View attachment 59047

I had the same problem when I upgraded my rcmk with obr heads, I think I used the rcmk washers or pin bearing I can't remember now?
 
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