I apologize, cannot resist a little story slightly related to starting maladies:

Renault R10 I used while a parole officer in rural four-county area became reluctant to to start. I made many unannounced visits during the workday so I came to just leave the little sewing maching engine running. Unfortunately, parking brake cable was rusted solid so I carried a brick to chock a tire with. On more than one occasion I discovered the auto moved from my spot and resting against the nearest tree, post, etc. Always parked where other autos would not be stricken if it rolled. Also, on serious slopes I simply shut down knowing I could roll and pop the clutch to regain self-propulsion capability and always found an immobile object to park against rather than trust my chock and the gearbox.

I learned later that some of the local gendarme thought it amusing to move my running auto, apparently it never jumped the chock! I had figured if anybody was doing it, it was a parolee jerking my chain -- here it was the "good guys." And these clowns from different counties spread the word to watch for the chance to do this to me...

BTW, those Renault seats were the most comfortable auto seats my tush has ever visited -- and in such a tiny car. Sorry for the discourse. Saw the "banging on the solenoid fix" and suffered a flash of nostalgia for those days. Have had my share of the rubber mallet incidents.

Recently discovered a few flywheel teeth on our '65 Mustang which are suspicious and the likely cause of a very occasional starting difficulty. There has been no grinding or spinning of the starter, it just locks up on the flywheel so it sounds like the solenoid is bad, just clicking away. Pulling the starter is a thoroughly simple 2-bolt job on this car and I just pull it, move the flywheel a couple teeth, remount starter and go. Defintely easier than replacing the flywheel.

Good luck