Pretty simple query.
If you look at the image i posted, i know i can unscrew the blue bit, but that tube doesnt fit any of my adapters, barlow tubes or anything else, and neither do any of them fit/screw into the hole left in the prism block.
Looking up online, it seems that the straight through finder of this type CAN be unscrewed and modified as i wish, but i just cant seem to unscrew the blue part on mine in order to remove the red circled bit.
I figured id ask you fine folk before i attempt it again with more force..
I mean, if it doesnt come off, ill just use some gaffer tape, but thats not ideal
Thanks in advance