I have a HP12C calculator, doing fine after all these years.
The only problem I have is that two of the rubber "feet" on the bottom came off and have been lost.
I wrote to HP twice, once in Corvallis and another time to (I think) Palo Alto. Neither time did I receive a response.
Does anybody know where I can find replacements?
You can pick up rubber feet for the HP-41 at the following internet address: http://users.kcyb.com/joehorn/educalc.htm I am not sure if these will work for you but it is worth the effort at $1.00 each.
The rubber feet for the 28s are the same than the one they use on the Voyager series (10c-11c-12c-15c-16c).
I have the real rubber feet if you still need. US$5 for a set of 4 post paid.
A Burg POB 111 Moorpark CA 93020