I just acquired an Askar FM135 and wanted to try some solar with it. I had some Baader solar film so designed this holder. It is very very tight and you may have to adjust for yours, don't twist it on would be my suggestion, just push gently. How you secure the solar film is your call, but beware of using superglue so close to glass if you choose to secure the inner part with that. Also, it goes without saying NEVER LOOK AT THE SUN OR POINT YOUR SCOPE/CAMERA AT THE SUN WITHOUT THE CORRECT EQUIPMENT, BLINDNESS AND DAMAGE MAY OCCUR.