yeah, mine does that 'clonking' noise, it only vibrates on braking at approx 50mph, and at times it can feel quite violent.

the thing to do is tap the bush back into the bulkhead, and with a centre punch, punch a hole into the shaft just after the bush. this is suppose to stop the bush falling back down. who knows you might even be able to put a 'jubali clip' (spelling!) on the shaft to hold the bush in. just a possibility.

Riggie