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.