I seem to recall seeing cap screws used on starter motors.....easier to access the head with an allen key? Socket access can be a problem?
Which is which? The book shows m45g using a hex-head bolt with a scredriver slot in the head - 90611504; 3m100 shows a normal hex head bolt with same number without the slot. Numbers starting 90 dont appear in the index.
The 90 prefix is just to identify it as a Rover part 611504 as opposed to a Triumph part 611504 renumbered 88611504Which is which? The book shows m45g using a hex-head bolt with a scredriver slot in the head - 90611504; 3m100 shows a normal hex head bolt with same number without the slot. Numbers starting 90 dont appear in the index.