Drilled steering heads
I was with DW (we were racing at Cadwell in 1975????) when he picked up the Shadow forks from Tony Maughan. I think therefore that "my" bike has "my" forks. Although 1) that's not certain and 2) I don't care.
(Highlight of the trip was going to a pub, as we did in those days lest we suffer the curse of sobriety, after the fork collection (in the dark, I stayed in the van), somewhere in Lincs, when I suddenly realised that the person I was looking at in the bar ,was Tony Blackburn, in a blue velvet jacket. He was surrounded by the sort of girls that I imagine would fancy David Cameron. Or Cliff Richard. I said to David "Hey, that's Tony Blackburn" and he said "Oh! Who's he?". There is no answer to that now. Or then.)
So far as I know, your bike was built using Dick Sutherland bits. This was in the days when building a bike that went like SoaS, as BTS 62 always did, was judged more important than having matching numbers. I vividly remember riding back from the Southern 100 in 1975 and on the Moffat road realising that BTS 62 had a motor 10 % faster than it's chassis could cope with, and, mercifully, only marginally less than I could cope with. It did however help me develop a small toroidal muscle low in the body that when I reached Balerno could cut 1/2" iron bars.
I'd rather hoped to provoke "the old guard" into saying that drilled forks lasted from noon xx/yy/19zz to noon, aa/bb/19cc, but no takers yet.
You'll be at Applecross in June? And if not, it'll have to be a really good excuse.
Tom, my bike has drilled bosses as described although i dont know the exact age of the forks - I suspect that you may not have the original forks for your bike as there was a bit of swapping round when DW got two sets reconditioned.
Mark