I’ve just installed a SPINRITE 3-1/4hp variable speed router motor in the router table next to the shop bot.
It uses a completely different collet system than the broken porter cable motor that it is replacing. There is one retaining nut that holds either the 1/4" or 1/2" collet insert in place.
On the shelf please find a cardbosrd box with the manual, wrench set, and opposite sized collet insert. Please keep these items together.
And, Happy Making!