Pulled my starter today for the second time in two weeks. First time was to replace the solenoid contacts because the car wasn't starting; today because yesterday it didn't start again and I wanted to check the contacts. Looked like they had rotated a little when I had tightened them down before, so I straightened them out, added a locknut, tightened everything down good and proper and reinstalled the starter. Then when tightening down the battery cable I noticed that I accidentally let the post rotate a little, so I took it out again and rechecked the contacts. Sure enough the corresponding contact had shifted, so I straightened it out again and reassembled. First try the car didn't start but it did start each of several subsequent tries. I was tempted to pull the starter yet again -- getting pretty good at it by now! -- but I'm working out of doors and was running out of daylight. I think I'll give it a week or so to see how it behaves then pull the starter to inspect the contacts. If all else fails I'll just bin the starter and put in a new one.
What's that saying about not having time to do it once but having the time to do it twice?