dont know if any of the guys on here have ever used any but I have been making some for about a year. I use the same type resin everyone including myself have been making A-rigs out of 90second alumilite resin which has a 600 degree heat range and use RTV silicone for the mold the head can be any style you want I use a flat eye arkie for my head a gamakatsu 5941 or mustad 32796 I use fly tiers lead wire to balance the rate of fall (I have 4 different ones I use) and they are all slow fall
I mold the head with a basepin in it so I can paint it with powder paint or airbrush plus it keeps the resin from impregnating the weedguard and rendering it useless.
Anyone who is serious about fishing should find this useful and informative and I am always looking for ways to modify/make my own tackle if possible