RoyBoy posted:Lubricate the solenoid with graphite, NOT oil. Oil will gum up the works. You might have to clean the solenoid with electrical contact cleaner that can be found in auto parts stores. Some of these cleaners attack paint, so read the labels and test first.
Thanks Roy for reminding me to try contact cleaner. I used Wd-40 , which made it move more easily bu still not properly. A spray of the CRC contact cleaner fixed the problem so it's now working well.