Having asked about an extra oil feed for the valve gear, and then seeing that a ready made-up version was going to cost 101 Euro. I decided to make my own. Here’s how I did it, and the mistakes I made (so that you won't make them as well).
First I acquired a 8mm and a12mm single ended banjo union and matching bolt. These I took to my local hydraulic pipe service to have about 250mm
wire braided oil line crimped on. Next remove the 16mm blanking plug from the rocker box, drill and tap this to suit the 8mm banjo bolt. Note: the normal 8mm bolt has a pitch of 1.25mm, whereas the banjo was 1mm, so the 8mm tap that you might buy at your local hardware shop is probably not going to do. Luckily I had a 8 x 1 to hand. However to prevent too much oil being delivered to the top of the engine some form of restriction needs to be fitted to the system. In the professional made version this is achieved by fitting a number 60 Dell'Orto jet. These have a 6mm x 1 thread and happily this is a standard size, so the 8mm banjo bolt was tapped this size and the jet screwed into it's end. The OD of the jet was somewhat larger than 8mm so once fitted in the bolt it was skimmed down to size.
On the right hand side of the engine there is a “U” shaped pipe held on with 2 “Acorn” 12mm nuts. Remove the top one of these and replace with a short adaptor made from 19mm hexagon, about 30mm long, drilled and tapped to suit. Now this is where I went wrong, so pay attention. The banjo bolt as supplied was 12 x 1.5 (standard bolts are 1.75 pitch) As I had a 1.5 tap I thought all would be well, it wasn't. The engine turned out to be 12 x 1.25. So I had to make a new adaptor and banjo bolt. To do this I purchased a tap and die set off E-bay at a cost a less than £7.00, possibly not the best quality, but for what was probably going to be a single use I didn't think it mattered much. With the new adaptor in place the pipe was fitted, not forgetting new sealing washers and the job was done. The photos my previous posts show the completed set up.