BOSCH Maxx tapping noise when spinning?

Had this machine trouble free for ten years - so can't really complain. Recently it has developed a tapping noise which gets faster and louder as the spin speed increases (doesn't happen on wash cycles, only when the drum begins to rock when spinning). Took top off and checked that nothing was fouling the sides, but when innards are moved to the right the click occurs. Judging from where the sound comes from I think it may be the bottom shock absorber making the noise as it flexes sideways. The anchor points are sound and rubber bushes intact. The machine is in the garage so noise doesn't bother us. However, is there a potential disaster ahead? Will shock absorber collapse? I would replace the shocker, but while the end anchored to the machine is a straightforward nut and bolt job, the anchorage at the drum looks a little more complex. Is it a viable do-it-yourself job?