I got two RWS 54. I got the same problem with droop and shooting off to the side. I hate shimming scopes. Especially on these RWS scope eaters (why put more stress on your scope on these magnum recoilers?). These RWS need an optically centered scope.
I did try modifying these cheap Chinese anti-recoil mounts with limited success. I cut off the top and bolted on a Picatinny rail. I then shim either the front or the back with washers to get the droop I needed. I guess in theory...if your off set the attachment screws on the rail...you could account for the left- right adjustments too. I was thinking of epoxying everything in ...once adjusted.
Very crude...I know...I'm not a trained machinist...just a hacker with too many ideas and tools and not enough experience and time (my dad would have been horrified if he saw this...that man was a mechanical genius)
View attachment 397530 Next attempt would be to flip the two mounts upside down, unscrew the top half of the mount and leave them off. That way you don't need to cut the mounts off. Drill holes to attach a flat plate. Then mount the Picatinny rail to the flat plate.... That's going have to wait till I finish my Honeydolist...got a retaining wall that needs my attention.
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lateral and vertical play? just drill more holes and put in centering set screws.