For those without access to Darren's supply of replacement rubber feet for their crumbling footwear I offer the following tip:

Get a set of Jaycar HP0830 rubber feet.  Winkle out the old TiVo ones and save the parts, you are going to re-use the sleeve and rivet.

First use a 3/16 drill to open out the hole in the new feet a little. Use the same drill to remove the sharp leading edge on the case.  Fit the sleeve part thru the hole and offer up to the case, lubrication helps - I licked em - and push carefully thru.

My pusher was a compass point with the top bit off a spark plug to supply the force.  Gotta be slim otherwise the sleeve bit gets expanded before you want. After the third try you will see what I mean.

Once thru and flush with the case, fit the rivet part and force it into place completely.

Result is a beautiful set of feet.  Done two cases now and they look nice.