There's a yoke

Very nice! No hint about the square hole though.

Bet a large washer would work for the round part....just weld on the handle, instead of cutting the whole thing out of plate...

Just ordered one, no square hole on this one.

The square hole is for jaw post nuts. I made one for #5's that a friend of mine needed. He says it works very well for him. A simple circle for the cam did not work well for the #5's , it needed to be an ellipse to work the way I wanted

It fits a #14 Newhouse pretty good. Handy to know.

Nice, thanks Big Sam.

Very welcome. Thanks to you and Ric for educating me. I've got a #14 on the way for my boy, now I'll have to give him a setter with it.

This thread turned into some great info!

In theory when you cam them over and the flat spot is on the spring they should stay without you pressing down on them. This doesn't always hold true on waxed traps. The ones that hook on from the side seem like a good idea if they are sized for the width of the springs. I have the Jiffy ones that slide over the springs and my SC 4 1/2s springs get narrower towards the eye. The loop has to be wide to slip over the end of the spring but then on the narrow part of it the cam can slip off the side of the spring.