I have a 12 1/2 x 48 manual Cincinnati Tray-Top. I have not had an issue with it. I did, after getting it home, due a strip, clean and reassembly.
I have read that the headstock gears are prone to chipping or breaking because they are thin but mine are just fine.
I had my apron apart for cleaning, the hand wheel shaft is a little loose but I did not disassemble this to bush, I'm running it as is. When reassembling I drilled two holes in the clutched lead screw gear and then used a socket with two pins or post on it (four wheel drive axle nut socket with two fo the for posts cut off) and a torque wrench to adjust the clutch slip point.
If you need a manual let me know. I can send a pdf to your e-mail.