Is there a secret to getting the rubber boot off?
The "trick" is to press the light socket out, boot and all. To do that, assuming that everything is disassembled, force the wire up where the bulb was and clip the terminal off - leave about 1/8 inch wire on the terminal. Now the wire can slide out of the boot. The plastic insulating base and spring are also free so don't lose them. Find a socket that will fit where the bulb was and, with a long enough extension, you can "press" out the socket and boot. You don't need to take it off at all. Besides, you don't want to plate the socket and its innards any way. You can slide a new section of insulating sleeving over the wire before you reassemble the socket. To reassemble, put everything back the way it was in the socket, wire thru the boot, spring, plastic insulator and pull enough wire thru so it stays. Strip off 1/8 inch of wire insulation and solder the terminal to the wire. This is critical - make sure that the solder joint does not bind up at the base of the socket or the bulb won't go in and lock. Of course, if you happen to have a replacement terminal handy, you can use that. If you are lucky, you may be able to remove the clipped off wire from the old terminal. The ones I've seen are crimped and sometimes self-destruct if you get too aggressive.
One more thing. The two rivets that hold the lamp "thingy" to the mounting frame are not supposed to be gold zinc plated. I drill out the olds ones and disassemble those two pieces. More often than not, the plating process leaves some "liquid" behind and it oozes out between the two pieces. I use new rivets, but if you opt to not remove the rivets, you "may" be able to remove enough of the gold from the head of the rivet by using an ink eraser.
Jim