Re: Identify Turn Signal Lense Screw
They are actually a machine thread, with a relatively short (about 1/3 overall length) threaded area and a larger unthreaded "barrel" (the correct hardware terminology escapes me right now...), and a Phillips head. If you really need the thread size and pitch, I will dig mine out, but you won't find them at the hardware store.
If you have an 06 Rick's catalog, they are at the bottom left of page 146, item HW-14K, $6.95 for a set of six.
69 'vert project big block/TKO 600 RR
68 'vert driver RS clone -- gone!