Right, I have a truvitave bb witch is a 73 mm shell but it come with a spacer to make it 68mm so i wack the sapcer on the driverside screw in that cup. Now I screw in the non driver side cup untill it stops, but theres still 2-3mm of space left that side is this how it should be ? Ive not a clue what going on anyone care to help? Sam