I had no idea what the leaf tension was when I first saw it, and didn't even know what it was called, until I saw it on a thread here. I had seen pictures of machines with that system, but hurried over them. I stared at it for days before it started to make some sense.
The set up came with a Singer button style foot control, so for $10 I figured I'd be OK on the purchase. I have two other VS machines to work on now and am looking forward to them.