....As there is no fixed side to the rocker shaft it seems to be a guessing game.
...
The way I figured it was that the shaft should be pulled tight to the timing side with the big acorn nuts, then the fit the banjos.
Something I've always overlooked is that the oil pumps *into* the banjo bolts from the outside into the shaft; it's just too easy to think it pumps out even though I know it doesn't....
.......I made a couple using some nitrile sheet from Clark Rubber .....
I already had some 1/16" thick so used that hoping it has enough integrity, and when I did it, I punched 1/2" holes in the centre to go over the rocker shaft, and made the outside oversize so if they 'creep' still have half a chance at sealing. I've since considered that I could have punched the centre holes @ 5/16" dia., or a loose-snug fit on the banjo bolts to self-centre them, so long as the washer doesn't obstruct the feed holes.
Dowty washers should do the job just fine,well, that was the answer on my engine.
That could well be worth it if available in that size, but I think not readily in my part of the world, but also keep forgetting to chase them up...
.I also made a 'clip' to stop the bolts from unscrewing- thinking I took some pics, 'll have a look later
Had a look for pics, but seems didn't take any, will do in the morning...
Edit; it's now morning so'll just add pics here