I was annoyed. Or maybe that was, I was a noid.
I hit the starter and only heard click. If I hit the starter enough times it would start. When it did, it turned over properly so it was not the starter motor or the battery.  When I pressed the button the headlights went out so I knew it was not the handlebar switch or circuitry. That left that darned silly noid.
To get the one out of my parts bike meant removing sidecover,saddle. battery, battery box, carburator booty, and aircleaner box. This was shaping up to be a two day job.
When I went to the riding bike and began, I was looking for shortcuts now that I knew all there was to know about what was in that hidden space where the silly noid lived and died.
I could touch the flanged bolts with an articulated wrench but not see them at the same time or get fingers into the space. As I worked I began figuring how I would get it back together without all the extraneous disassembly. As I lifted out the old silly noid, the brainfart hit me.  I hacksawed a notch in the tab of the lower hole, see the photo.  This allowed me to put the lower bolt in place, before putting in the solenoid. Then sliding it onto the bolt, putting in the upper bolt and tightening the both of them.
It only took about an hour instead of the dreaded two days of profanity.

Phelonius

D*amned Klever.

Where there is a Will, there is a way!

& where there is a Method, theres a Methodist.

I sort of wondered how many of you had bonked you heads against this problem in the past. Obviously the original was put in before the rest of the bike was assembled. Great engineering how they hid it down that dark narrow pit, as if it would never need to be replaced.
BTW, the only wrench I could get on it was an open end on one end with a swiveling socket on the other. I could barely turn it one sixth of a turn at a time. A real joy.

Phelonius