Contact breaker adjustment nut sizes

[Captain Mike]

Hi All
Can somebody tell me the size of the nut on the contact breaker for adjustment, cant get anything in there except the correct wrench/ spanner but I don't seem to have anything that will fit and can't find any info or spanner on the usual web sites

1957 G/F plunger


Thanks
Mike

[Ian C]

Not sure of size, but you may need a set of magneto spanners (for BA nuts I believe).

[JulianS]

The  nuts are 4BA (and threads are 3BA). Not much space in there.

[idie]

I find that a 7mm spanner will fit.

[Captain Mike]

 Hi All thanks for your help

I will look for some magneto spanners, I tried  7 mm spanner but it was too big and the 6 mm too small
Any Ideas where to get the Magneto spanner set ?

Thanks

Mike

[bikerbob]

You can pick them up from ebay put this number into ebay and it will show you a set for £6 133653421964

[idie]

That's the problem. With metrication the hexagons are most likely metric on replacement points.