Hello All If I can put my ten cents worth on this one The valve stems , the guides , the followers, the follower rod and nut housings all suffered severe wear on the TS. A friend of mine came up with valve guides from Z4oo Kawasaki but they are probably too obsolete now. The old ones do drift out. If your seats are past the stiff attack with a wire brush in the drill this is how he did the seats. He selected a discarded TS valve that wasnt too worn in the stem and with a cutoff blade in the small angle grinder cut a radius cut in the head of the valve. Within this cut he then inserted a piece of triangular lathe tip tool with cutting clearance, and then silver soldered it to the seat angle. All that is needed then is to cut the new seat carefully with the aid of a battery operated drill. Sorry dont know what replacement valve but maybe Datsun 1200. Short of the Adjustable followers , Maybe you have a mate with 16H Nortons.Got another story coming up on modifying a TS and CW but need to borrow some parts to photograph keep on watching. ( sorry no pics this time on the cutter couldnt find the one I made. ) regards Al