HP-65 more on the card reader

[albertofenini]

Hi Everyone,

I would like to share few things on a card reader restoration (actually two) that are driving us nuts.
After successfully recovering two units, from garbage condition to being able to read ABD write cards,
yesterday we attempted this on two more units.
Both were working except for the card reader.
Basically we have three different type of materials for restoring the gummy wheel :
- o-ring
- square o-ring
- silicon tubing
Traditional o-rings are for me the best, the stay in place and give no problems.
Square -o-rings tend to separate, one remain close to base of the wheel, the other after few readings slips to the opposite side,
generating friction with the card reader structure and slowing down the motor
Silicon tubing (coming from TAS) is a little loose on the wheel (ID slightly too big) so we glued a little and it fits ok.
Also, opening this unit S/N 1511A..... we have found what was looking like a brand new motor,
with brand, model number and I have sent an email today to inquiry if it is still available.
This unit laso had a black "axle" differently from all the other we have where the axle is white.
(Is axle the correct term for this part ??)
It also features a very tiny point on the hard, wondering if this serves to position correctly the eccentric cam.
However, the worm gear although all intact was loose, and we swapped this motor with a different one
where the clutch has been somehow fixed and the strength is good.
I'm posting the first four pictures and I will continue with a second post in this same thread.