HI, RECENTLY PURCHASED AN OLD SKOOL TIOGA REVOLVER CHAINSET OFF EBAY AND WAS TOLD IT HAD THE ORIGINAL NON DRIVE SIDE CUP MISSING WHICH HAD BEEN REPLACED WITH A SPLINED SHIMANO ONE WHICH WORKED BUT HAVING TRIED TO FIT IT TO MY '97 GIANT ATX 990 TOMAC EDITION DH BIKE WHICH I'M BUILDING, NOTICED...