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Engine Help-Dynamite .21 for Vintage USA-1

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Monkey Wrench

My last words will likely be, Crap that didn't wo
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Hoping I can get some help. My Dynamite .21 arrived for my Kyosho USA-1 rebuild.

It'll fit, may be a bit tight, but it'll fit.

Problem is, the flywheel that came with the rig won't slide over the brass collet that came with the engine up to the front bearing.

So, question is, can I drill out the flywheel opening so I can get it over the collet? Anyone done this?

Some pics of what I'm dealing with. Appreciate any advice or tips!

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