Originally Posted by John_M_

I agree, leave well enough alone... those are common allen head cap screws, probably no better in quality than what you can get from harbor freight... of course one hopes OS uses better spec'd screws... but dealing with such small fasteners, manufacture defects are more common... David's curiosity may have stressed an already defective screw... If I were to take one apart to that extent, I would replace those cap screws with some from an reputable source, possibly from an aircraft surplus supplier... it wouldn't take much rework to improve the reliability of those fasteners.




Nice job Cat... engine sounds good. 👍