In case anyone has an older Scamp
like mine (88) with a swing down jack, I found an exact replacement really cheap. My "hub" is welded to the frame and you pull a "pin" and it swings (pivots) down. My jack had been severely abused and the handle grip gone. It turned hard and I was sure I would need to have someone re-weld one on. One day I was walking around in Harbor Freight and I noticed a Jack that looked awful familiar. I bought it and took it home. It turns out to be an exact replacement and all I had to do was pop off the big snap ring on both jacks and swap guts. Even the pin hole lines up. YMMV, but Easy Peasy and priced right. Here is the item if you need it FWIW.
Heavy Duty 2000 Lb. Capacity Top Wind Trailer Jack