huuuuuuuuuh , hi ,

dont you just hate it when a simple repair doesn't work .?
so i have a small issue with my bb ill give you the details maybe you can tell me where i went wrong .

i have a tarmac sl2 2011 comp , it came with a rival , crank gxp , with a threaded gxp bb, really basic simple stuff .

i wore it out , it got play , i bought a replacement bb , English 68/73 .

the only difference i noticed is the NEW bb has a plastic cap on the drive side that wont let the crank slide through , on the OLD bb it has no cap .
so i took the cap off screwed the cups into the frame , slid the crank in , and still has play , even being super tightened ,

i tried two cup spacers , cranks would seize when tightened .
i tried one spacer on drive side , seems to work but still the slightest bit of vertically orientated play , just a tiny little wiggly notchy bump , and wont go away . ( plus the original BB cups didn't use any spacers )

i feel the parts are identical , i did think there might be a spacer that goes on the shaft , on the drive side , i might have misplaced ,
because i know i use that kind of internal shaft based drive side spacer on my pressfit gxp bb setup .

this should be an easy strait switch NO ??? i really dont get it , but thanks for the info in advance >>>>

The plastic bushing is necessary to make the spindle fit the drive side bearing. Your old one had it too and it is probably still stuck on your crank spindle. No spacers are necessary with a GXP bottom bracket with a road crankset. Don't forget the spacer/dust cover on the non drive side(it has the star pattern in the center) or the crankset will have play regardless of how tight you make it.

Ok i see got it thanks.