Theres No Such Thing as a uneven spark ! :lol:
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O. K. worth having a look at the SLIP RING as its rotateing . The thing in there that the HT lead pick up / carbon brushes run against .
It should be ROUND . Light Wear can be lated true . Horrendous ravines mean a new ones needed .
If thats ok , Belt it with a hammer ! . 8) 
RIGHT , the CENTRE of the Rotateing Points Plate . On the Brass adjacent the retaining bolt .
Its on a tapered seat with a fixing groove for radial indexing .
Points gap should be .014 to .016 . , unusual to get both at .015 and DEAD EVEN fireing point . BUT YOU WILL GET EXACT DEGREES ON BOTH .
only a womble wouldnt .
The idea is to TAP the thing lightly with a drift ( Alumn. ) & hammer . Very Lightly , Almost - you still have to tap it to get it to shift A THOU.
Unless the slip ring is junk , setting from T.D.C. on BOTH CYLINDERS , and checking , and persevereing , will get it SPOT ON on BOTH ,
within the parameters for the GAP , ( points ) described . If you want to wreck it , run it 4 degrees out .
Wonder if this works on 4CA c/b sets . :lol:
3/8 " b.t.d.c. is likely RIGHT . You can see why manual advance isnt a bad idea . But get exact timing on all cylinders . Or its of to the salt mines for you .
