I was refering to Manic Mechanic AKA Creative Engineering....
Jim is the man.
I'll post some pics later.
Thanks, 210061741, I should have realised. I was going to buy his sprocket and adaptor, before deciding to go the shift-kit route.
I'd almost forgotten that I'd asked.
It rained until dark, then not a drop since. Test-ride tomorrow with my shift kit. The forecast is for scattered showers, that's much better than the last few days of torrential downpours - a couple of days ago we had 180mm, (7"), in 24 hours.
Looking forward to seeing those pics.
I'd still like to know the compression in psi, too. The RSE billet head weighed in at 142psi and is bloody hard to turn over, but the extra power throughout the rev range is worth it.
Also, how much for the Manic Mechanic head, out of interest?
... Steve