I was given a bag of open sight parts and told they will work together. Its a redfield Palma Rear sight, and a Merit disc. From the Merit website, I believe it to be a Merit number 3LS, With 7/32-40 (12-40) threads. The Palma Sight has 2 thread adapters / reducers which seems to bring the internal threads to a number 10?, 10-32 or 10-40. Does anyone know who may offer the thread adapter or any combination of adapters to get from the palma internal threads to the merit threads? The email address of the merit website did't respond, and no one seems to sell or have merit parts in stock anymore.