Fitting big rca plugs into old Scott TUbe amp

I have an hh scott 340b. a couple of years ago I used the phono section with a rega p-5 turntable. the ends of my rega rca casings are threaded and can be unscrewed and then slipped down the cable. by moving the casing on one of the rca's, I was able to connect both rca's into the reciever. if you can't unscrew your rca ends, you could put female to female connectors on the rega rca's and then use rca's that do unscrew. (the phono section on the 340b is mm)

Thanks Muddys. I'll have to scrutinize the rca's again to see if mine is similar to yours. I don't recall there being any threads but i'll double check again. Worse case, i'll do the female connector idea.