Geo's recollection is good. I'll add, that if you're taking the ring gear off, I've read in some Triumph service manuals that it's advisable to mount the ring gear 90 deg from where it now is if there is wear on the teeth. Generally, the engine stops in one of two places 180 deg apart. By rotating, you will get a new set of teeth exposed to the starter drive when it enters the ring gear. Look at the ring gear very closely, and see if you see any of that wear pattern.