I also prefer metal throttle assemblies. I've found quite an assortment of different kinds on mopeds. They look vintage and work great. Heavy duty straight pull with smooth action. Most will acommodate a small brake light switch and some have extra levers for the choke. Not needed items can be trimmed off and smoothed over. The housings are aluminum and can be polished. Availability depends on your location. I get mine from a local moped shop and ebay.