replacement for nylon balls in HP97 card reader


Hi everybody, while restoring an HP-97 card reader, I have noticed that only one out of the original four nylon balls was in place. Has anybody found a compatible item for replacing them ? Thanks in advance for help, Alberto


1/8" nylon balls

Shipping will be more than the parts...

Send me an email and I will post a set to you.



I found these replacement balls some time ago and have been using them ever since, but never found a suitable replacement for the rolling-pin shaped part. Do you have an alternative?



...Do you have an alternative?...

Unfortunately no. But on the up side, the only bad ones I've ever seen are the ones I lost ;-)


I read from someone who used a watchmaker's lathe to build one. It did come out fine, I think he used brass, but "Never again" was written (maybe between the lines) IIRC.


I remember something like that too. Since I haven't seen these on ebay, my guess is that it was much too hard to repeat.


I agree, get 1/8 inch balls at

I use the Delrin balls myself.

Possibly Related Threads...
Thread Author Replies Views Last Post
  Reasonable price for a 41C, Quad Mem, Time, Navigation and Card reader module? Eelco Rouw 10 3,884 12-12-2013, 01:52 AM
Last Post: Eelco Rouw
  hp-67 card reader problem. Marcel Samek 5 2,654 12-09-2013, 09:09 PM
Last Post: Paul Berger (Canada)
  HP Prime Program: Sampling Without Replacement Eddie W. Shore 13 3,032 10-04-2013, 12:22 AM
Last Post: Joe Horn
  HP48GX screen replacement Francisco Quiles 9 3,104 10-03-2013, 09:17 PM
Last Post: Francisco Quiles
  HP-97 card reader pinch roller axle davorin 2 1,305 09-15-2013, 08:47 AM
Last Post: aj04062
  HP-97 Card Reader davorin 3 1,521 09-13-2013, 04:21 PM
Last Post: Stephan Matthys
  HP 2225D+ RAM failure/replacement Luca 4 1,578 09-10-2013, 01:46 PM
Last Post: Luca
  HP 15C-LE replacement still available? Borja 16 4,288 08-22-2013, 11:16 AM
Last Post: Michael de Estrada
  HP-67 Card Reader Repair Question aj04062 1 1,253 08-08-2013, 11:15 AM
Last Post: Randy
  Battery replacement HP75C Chris H (UK) 1 899 08-05-2013, 11:02 AM
Last Post: Sylvain Cote

Forum Jump: