The KBF-1 is an exact reproduction of the #042-022369 B-3 type upstop felt. An essential part of any Hammond console restoration or busbar lube job, it helps restore the "new feel" and quiet operation to the keyboard.
Easily installed on late A-100, B-3, C-3, D-100, and RT-3 organs. (These organs are identified by front strips that are secured with Phillips head screws.)
Also usable on earlier consoles. However, front strip removal on these organs requires substantial disassembly of the keyboards.
Two required per organ (one for each manual).
Hammond enthusiast Robert Herrmann has graciously allowed us to post a link to his very informative video detailing the replacement procedure for upstop and downstop felts:
Removing the front strips on older Hammond consoles to enable felt replacement presents challenges that aren't encountered on later organs like the B-3. Detroit based Hammond specialist John Doyle demonstrates his approach to this job in the following videos.