[Wavytone]

I have two particular eyepieces I quite like but the darn things have undercuts on the barrels which mean it's virtually impossible to get them to stay in a TEC turret - they fall out when rotated.

I'm at the point where either I sell these for something else (without undercuts) or cannibalise the barrels off something else, if I can find some that fit.

Apart from adhesive tapes, anyone have creative ideas on filling these annoying gaps ? One idea I have is to cut rings from plastic pill bottles but I know the lock screws on the turret tend to work loose on plastics.