Hi Bill,
That's a good solution, I was just keen to keep the gun as original as I can.
The later Osprey ST's used an Anschutz sight as standard fit, and the width in the dovetail is a mile apart, hence the little adaptor. The Anschutz clamp might only be about 9mm thinking about it, and the Osprey rail 13-14mm.
Cheers
Greg