I broke off the spool tabs on my gsxr and have been using the under swingarm style since. Sometimes it gets in the way of removing the axle, sometimes it slides forwards when I'm dropping the front or working on it. Wanting to just put spools in the side just in front of where the axle blocks stop. Should I drill and tap it (which I can't imagine would be a lot of threads) or use a Helicoil or Timesert (which I have in m8 x 1.25). Also thought that a heavy bolt like a m8 in a crash could crack/twist the swingarm material.
If I broke the spool bosses off my swing arm I'd either buy a used swinger or get a set of those bitchin' Lightech chain adjusters with the optional lifters.
Man, I'd rather have new spool adaptors welded on. Them breaking off relieves some of the force being transferred to the swinging arm.
I drilled out my swingarm to accommodate a shark-guard. There isn't a lot of meat there to thread. You'd get 2-3 threads max - which probably wouldn't hold up after routine stand use. I'd go the welded option.
Riv-nut if you don't want to weld. Not the cheap junk that comes with shark guards, but nice knurled style from McMaster-Carr.
Call pit-bull, I bought a set of ready to weld on spool adapters for my f2. I'm sure they have aluminum ones. Charlie welded it on for me since I was local but I'm sure they sell to you and just get welded on.
If you have them welded with the swingarm on the bike make sure you unhook the ground off the battery and unplug the ecu.