How to modify a Suzuki starter solenoid for usage on a TR1

I remember a very irrate comment on a forum, where a user pointed out to me that a Suzuki SJ/Samurai/Vitara/Swift starter solenoid isn't a straight fit on Yamaha XV.To be quite honest, it really isn', but to be honest, not very far off.

As it is usually a solenoid for a plethora of cars, all you really have to do is find one of the 5mm holes in the face and thread it to M6. 

Then find an M6 bolt of the right length and bolt it to the cases.

Strictly speaking this wouldn't be necessary, but once the solenoid is a bit worn or the starter mechanics are a bit stiff, it might not be able to pull the hook all the way in and as such not engage the starter gears fully.  Another thing: the long stud is the one where the battery wire goes, the short one goes to the starter.