I made my own for my Bald Eagle rest.
I made the screw for all three feet and not just the back.
I also made longer screws so I could shoot on uphill ranges like Tommy Mason's Stars & Stripes Schuetzen range.

I was the International Schuetzen Benchrest Champion on two occassions.

I only adjusted the speed screws on initial setup.
I had a perch belly rear stock and pushed my rifle forward or backwards to adjust for elevation changes.
It was easier and quicker to do instead of changing my benchrest position to adjust the rear screw.
Maintaining your benchrest position is more important and I try not to shift my benchrest postion to even adjust a screw.
With the perch belly stock I could move it slightly forward with a bump from my shoulder or pull back gently on the wrist of the stock where my left hand resided.

The larger screw heads made adjustments easier and their weight helped stablize the rest.
I also had my rest made with cast iron instead of aluminum.

What is more important for accuracy is a windage top and a stable front rest and maintaining your benchrest position.

I’ve used the Sinclair for several years, wouldn’t be without one. Ledball