OK. I got my 130s to handle heavy stuff. It is a ZZ machine, very straightforward and robust. Vertical loading, specialty bobbin that resembles a 66 but is not. I just finished a messenger bag out of waxed canvas(both Australian and US army tarp), calfskin, and deer hide. If it fit under the presser foot, the machine could handle it although of course I sewed slowly. I used #92 nylon thread top and bottom, with various needles 14-20. So imagine- two layers of leather, 3 layers of tarp, topstitched!
One thing- this machine does have a left mounted needle. It has a doublewide cleated belt, and if you see a machine without it, don't buy the machine. There is an add-on embroidery module for the 130.
I saw it open and it is all metal. Sorry I don't know about the cams- Ms Boats, any input??
let me know and I will pull it down, make a video, and post it for you.