You will certainly want to utilize a "bottoming" tap for final threading. This will reduce the risk of interference with the windings. But only by a little. It can be extremely touchy if you haven't had some experience with this kind of operation.
I know that the Orion/Kyosho motors can be disassembled quite easily. You just need to be very careful as I would expect you would be. The trick is laying out a pattern for drilling holes all around the end bell so you can properly clock the motor to the mount. DuBro as well as some other companies make a matching drill bit and tap but you will still need access to a good bottoming tap to properly complete the process.
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