The inside of the magneto, should there be a spring ?

[Stephen Arsenal]

Bike 97% ready,last question, the inside of the magneto,should there be a spring or something contacting the silver screw on the outside to the inside gubbings?. A cable should then go from the outside screw to the cut out switch ? My mechanic guy put my bike on you tube under BSA 1959 golden Flash,is only 59 seconds but it sounds great.

[LJ.]

Hi Steve... Yes there should be a small spring holding a carbon brush, very similar to the pickups. The carbon brush is then pushed onto the centre nut by the spring to enable earthing and cut out.

[Stephen Arsenal]

Thanks LJ,you would´nt by chance have a picture or diagram of the missing spring/brush by any chance?(rough Dali/Picasso would suffice) cheers-steve

[MG]

There you go, just had a K2F disassembled for overhaul today...

Not quite Dali or Picasso, more of Ansel Adams (well, not really)  
brush diameter 5mm
The cut out button connects the points plate fixation bolt to earth via this brush to stop the engine.

Cheers, Markus