I bought some hydrochloric acid for burning off the oxidisation layer just before plating, 100ml of gold plating solution and that’s it. The rest was done with a couple of batteries, leads off my multimeter, some magnets to hold the batteries and leads together and a spare bit of stainless steel rod with a felt wad shoved on the end. . Total cost was about £40 most of which was the gold solution and I still had half of it left when I finished my lights so I started doing my son’s toys, some coins, etc...
I looked at the plating kits on the net but the simple ones only consisted of a cheap power supply, a couple of leads and a steel rod which I already had all of anyway. Anyone with a few wires, AA cells, piece of felt or cotton and 2 elastic bands to hold it all together could do the same.
Hardest thing is to get the best finish you can before you start. I buffed with some metal polish and a minidrill. Wash well with deionised water and start plating straight away. If it’s been sitting around more than 5 mins after polishing, you have to connect it up to the batteries and rub or dip in the acid to burn off the oxidised layer just before plating ( Fizz, fizz. ). Hold the negative lead against the light, connect the positive to the steel rod with the felt on the end and dip in the solution then just brush up and down the light. The Wee I just dipped in the solution with the steel rod next to it.
There’s loads of videos on you tube that make it look really easy and it is. Just keep the chemicals well out of reach of any children. The gold solution is made with potassium cyanide which is highly poisonous.
I even plated the ends of some of my rechargeable batteries to get the best connection !!!