would have thought they would be standard type,similar to missile command upright/centipede,the happ type or something similar.you should be able to buy the rollers and the bearings and disassemble it and replace the parts yourself surely?
i did my missile command cocktail,if you have the bigger type,its enclosed in plastic enclosure,so its just a case of screws and pulling it apart?
the missile command cocktail are pitta as they have lots of parts and screws.