Do you deal with rotating joysticks to suit games like Heavy Barrel and Ikari Warriors ?
No. There are very few games that use these joysticks, so there is not much call for them. They are still available through several on-line arcade shops(use your favourite search engine and look for “Rotating joystick”), but beware as they aren’t cheap. If you are interested, there’s a very good website that contains plenty of information on connecting Rotary Joysticks to a PC. They also sell an interface for hooking rotary sticks up to your PC for use with MAME.