Uaglio's suggestion is a sensible one---the 'lollipops' are known to come apart, which will give you a very 'sloppy' gear-change. But before you go and order a new 'lollipop', check that the nuts (nyloc) are tight on the special 'stepped' bolts. The idea of the step is to allow you to have the nut tight, but still allow the 'lollipop to move in both the fod coming from the gear lever and the rod coming out of the gearbox--you MUST allow movement at both ends of the 'lollipop'. If the 'lollipop' has started to break up, try to retain and re-use the original bolts. on some of the 'pattern' bolts the shoulder is not long enough, with the result thatas you tighten up the nut, you end up locking the shafts onto the 'lollipop'. There should also be a 'spring' shim between the rod and the metal arm of the 'lollipop' (or 'tirante'--link, to give it its proper name)