fairly sure my sump studs are in blind holes..only way is take 'em out and have a looksee
Nope, the sump studs are open holes which go directly through the crank case.
This is why they are studs and not bolts.
Trev, for my own peace of mind, I just took mine out to check, and no oil dripped out and wire didn't go in so as I said all mine are blind, seems some do, some don't. I have Allen screws in there, just haven't got around to putting in the proper studs.
If Niges' are studs,and are longer, it's only to compensate for the thicker cover(fairly obvious), easy enough to check, just drop the cover and run a short piece of wire or tin around inside...??
Can't see why they'd be longer than need be though, and I'll assume Nige, you tried turning it with the sump cover off..?
How much oil did you pour in, shouldn't think you'd need more than a squirt or two...?
Also in addition to what Bill suggested, but more related to wet-sumping, not to forget the magnetic plug...!