My latest (other) project is a White LT-12 Cruise-matic ride-on mower. I'm in the strip-down stage and I'm struggling to understand how the speed selector works. The gearbox/transmission has only one lever attached which control forward/neutral/reverse. The speed selector is on the right hand side at the back and has stop/brake and 6 speeds. Looking underneath that lever connects the the brake and to pulley brackets through elongated holes and pins. The main drive pulley has a very wide pulley which I assume is a variable speed pulley, but I can't see how it works or what makes it work. The machine is obviously old and has some rust and maybe some parts missing. Can anyone tell me how it works or how it should work? I have some parts diagrams but they are fairly congested and difficult to see detail. Does anyone have better pictures?