Yes! I worked the inside with a file, to adjust diameter. Made it fit a MK3 action/receiver tube diameter. in 90% sideways extension it is usable, not ideal of course. Next is to tab the screw holes, which is a more specialised job I guess. So far so good! Thnx for pointing out the Freeadds PH16m, silly price (125 quid) unfortunately. I'll keep on searching for one.