You will need to wind the front lens group out a little to shorten the px distance. Will the lock ring undo by hand?
On my Night force NXS the lock ring was not glued but the front lens group carrier was, it need a little warming to soften and then it turned no problem with the aid of a very good fitting tool I made. I can adjust it now without heat but it is still a good firm fit.
You will want to bring it out until there is no px error rather than just a clear image to give the precision required for BR.
HFT, for people with only 2 buttucks!
VooDoo TwoTwo The next chapter.