Hi Mark1,
The bolt you refer to is a bit of a adjust by feel set up. They use a nylock nut on the clutch pull fork end.
All you need to do do up the nut until the top of the fork can be pulled towards the engine with your fingers freely and create approximately a 1.5mm gap between the fork and the chassis side plate. The rest of the adjustment is then done by the cable adjusting sleeve nut and bolt assembly to take up any cable slack.
Remember that centre bolt must be slightly loose (that's why a nylock is used) so as that the clutch has the ability to grab and release.
Hope that this helps you out.
As far as engine alignment is concerned all you have is the amount of hole clearance in the engine block, but that is enough to manoeuvre it into the correct position. Again this has to be done carefully so as that the engines PTO shaft with the clutch half fitted does not move the clutch cone sideways in any manner. Also a good clutch half is essential as if you have a flogged out one on the shaft it will not sit straight (true) thus alignment is not possible. Once this has been achieved then all you have to do is carefully lock down the engine mounting bolts.
If you have any further issue with this please don't hesitate to ask.
Cheers,
BB
