Ahhhhh, ok, that description helped. I thought from the picture that the left end was the end that slid inside the focuser draw tube, hence I couldn't understand how the lock screws would fit in there! And now I see what you mean, that the right goes in to the scope, the left may have a t-thread on it. OK, I understand better.
I'll wait to hear more from you when yours arrives though
Thanks for putting up with my lack of understanding