HP-65, 45, 80 On/Off Switch Problems

[jeejohn]

I have been working on selling my collection, but these 3 pose a little problem.

All 3 are having problems with intermittent power to the calculator. The 65 will work with the switch about 1/2 to 2/3rds of the way "on". With the switch all the way over to "on", it has no power. Otherwise, the 65 is in excellent condition. The 45 is bad, as it won't work with NiCds, but somewhat with alkalines (in a waterhosko battery pack). The 80 is similar to the 65.

I have searched the forums and found out about the lubricant that is between the switch and an internal contact.

I really like to get these working good. I am wondering if there is some way of fixing the problem short of having to open the calculators. If not, then are there instructions someplace about the process? I notice that the 65 has a different body than the others, so might require some different instructions?