I never thought the 6-32 would be too small. I chose them because of the physical size of the original flywheel. There was only approximately a 1/4" of flat aluminum outside of the steel center, beyond that the casting fell away in flutes. I no longer use the one piece hub. Too dangerous in my opion. I have just finished a new two piece prop adapter. It has an all aluminum inner hub and will be fastened with 8-32. BTW, I also have a Husky 62cc that uses the same method. It's over two years old and so far no problems. Anyway be aware that the bolts on the original mod didn't break, the steel hub to aluminum casting did. Thanks for all the info. Good luck, red