Idle Curiosity: The lower right-hand screw that locates and retains the points end bearing support cover on the M01 magdyno sits in a recess designed with a high shouldered rim. The screw itself acts to locate the end cover, but the head of the screw does not contact the sides of the rim shoulder, and even if it did, the height of the shoulder is well above the seated screw. Any thoughts from the group as to why the end cover was designed as such?

email (option): teladelujo@msn.com

John I've a feeling it was an attempt at anti tamper. From seeing several in the past, a special screw was used. It didn't have a slot but instead it had a series of ratchet type notches, which enabled it to be done up with a screwdriver, but NOT undone. My mag guy has drilled out loads of them and I've done a few. I've no idea why it was made impossible to undo without what I assume must have been a special tool. Probably in an attempt by Lucas to get you to buy an exchange unit

Ron

email (option): ronpier@talk21.com

I have seen this location used as a direct earthing point using a deep hexagon headed screw with a smaller grub screw in it's head. I don't know if this was a post-War use but it certainly seemed original.
REgards, Mark

I think you'll find that that earthing screw is used in the hole to the left of the subject one.

The brass earthing point is normal. But it is usually situated in one of the opposite holes, depending which one is used for the points cap clip pivot. I'm not an expert on mags, but I have dismantled a fare few for my mag guy so that his time is better spent on the rewinds and assembly. Ron

email (option): ronpier@talk21.com

It's entirely possible that the earth screw in the location I described was the creative product of the chap that rebuilt the magdyno on my early 500 Bullet. Several other problems made themselves known over the years which convinced me he was a charlatan but I know better now!
REgards, Mark

Yes, it is for a security screw. My magdyno had one and I had to drill the head off to take magneto apart.

The fitment of an anti tamper screw may have been to do with the Lucas guarantee...Ian

email (option): ian@wright52.plus.com

Thanks All for the responses,

Security screw makes sense; lve never incountered one on this side of the pond, perhaps only installed at the factory and once removed, replaced with the conventional slot screw head.

email (option): teladelujo@msn.com

Perzackly John. Ron

email (option): ronpier@talk21.com