I spoke to martin sweet at slipstream.
Apparently he nips the acorns, then torques the bolts (diagonally; and yes, I jabbed them into a bit of card, so they go back in as they came oot!), then goes back and tightens the nuts properly.
He said WD440 on the threads, and a wee dab of coppaslip under the (copper) washers. Good to know....
I had to buy another torque wrench- tho one I had could have put the Queen Mary together!!
And yep, genuine gasket. Why is the norton one 4 quid, and the Yam one 25???!! Pretty similar looking things!
Cheers anyway
A. Tighte-Scott
ps. yeah, that aprillia would be good as a supermono racer....