B31 Points cap retainer spring / arm wanted please

[Fraz]

I've found that the "points cap retaining spring" (don't know it's real name) is too short on my '54 Plunger B31 (see attached photo)

I need one that's 5cm - measured from the locating dimple to she centre of the mounting bolt.

Tried spares Stockists who say "they're just throw-away bits" and don't have one.

Having just fitted electronic ignition, which has a wire protruding from the points cover, I need the points cover to rotate as I use the manual advance / retard lever.
My retaining spring won't allow the spinning because the positioning of the locating dimple doesn't match the points cap.

Does anyone have the correct length retaining arm that I could buy please?

[V500]

I think you need to explain further as some of that makes no sense.

[Derek996]

I've fitted a Thorspark to a MO1 magdyno so I know what you are meaning. Since the Thorspark unit moves with the advance/retard there is a corresponding movement of its wires. There is some flexibility of the wires so the movement at the points cap isn't much. Presumably you have made a hole at the bottom of the points cover for the wires to exit through. I'd suggest that you elongate the hole to allow that movement. It doesn't need much 10mm should be plenty. Even with a longer retaining spring the points cover may not easily rotate.
There seems to have been two "Spring pin" assemblies available for the M01 magneto ; prt nos. 463898 and 463899, depending on whether the adv/ret is on the right side of left side.
Looking at your picture, I think the spring pin retainer is in the wrong place which is why it seems too short. On my bike it is mounted at the bottom left, where on your bike is the earthing terminal, which on my bike is bottom right with a wire from it earthing the magdyno to the bike.

[Kernowpete2]

It makes sense. Fitting the thorspark unit means cutting a slot in the points cover for the cables from the trigger unit to come out of. As the trigger unit rotates within the cover as the timing is advanced or retarded there needs to be enough slack in the cable internally or the cover would need to rotate with it. My B31 with Thorspark has enough slack in the cable for the cover to not need to rotate. It seems Fraz needs his/hers to be able to rotate a little with it and having a spring clip that sits in the centre dimple would help facilitate this.

[neil1964]

If you use a different mounting stud that is closer (ie the one bottom front) will it reach then?