haha, i did the shifter bushings already!!! i did need a 14mm spanner, and also a convincer, to knock the ring spanner around.... worked easily... of course if yours is stuck, you could also try WD40
did it this morning, and then went to work, coz i forgot to do my timeslip... was thrown a package, so i did that tonight, and finished (including working out new rattle-must tighten all bolts) started at 5, finished at 11, with 4.5 hours work....