Thought I'd add a note about steering head bearings that might be of use to another newbie like me.  I recently tried fitting some Pyramid Part tapered bearings (off ebay) to replace the original ball bearing setup, and although they’re advertised as a direct replacement for the TR1 (81 through 88) they’re not a good fit.  Both races were too wide and the bottom race fits flush with the inner tube leaving no purchase for later removal – I had to weld on some blobs to knock it out.  I think I’ll stick with the balls…. If it ain't broke don’t fix it… so they say.