Cee-Vee stock...I give up!

Is the thread (on the outside) long enough to get some mole grips onto, then stick a ring spanner on first, grind on the moles and voila? Unless (as is probably the case) it's corroded to buggery..

 Prob need some new bolts put it back together...

You could do it the easy way .. and just change the fitting on the hull?

EDIT

Edited by Ross

I had exactly the same problem on a RS stock.

i got screwdriver bit out of my drill set, clamped it tightly into a pair of mole grips so that it faced perpendicularly outwards and then wound the nut off with a socket set.

Cheers for the tips.  Stock is brand new...there's no corrosion.  Bolts are almost flush on the outside so there's no room for mole grips.  There's not enough room between the plates of the stock to get a bit from a socket/screwdriver set in (the stock is designed for a 21mm blade remember).  Not sure about the 90 degree driver, I don't have one, I had thought about it, but in my experience the end is usually more than 21mm long

I might try drilling it, but if it breaks or slips I risk scratching the stock, where at least  if I use the grinder I know there's less chance of that happening.  I've got a dremel, but even with that there's going to be marks on the black anodised bit of the gudgeon.

Changing the boat is a non-starter, the gudgeons on the boat are just plain 90 degree pieces of folded stainless...changing it to a seasure pintle means filling and re-drilling as the hole spacing is wider, and the reinforced part inside the transom won't be right either and will need windening too.

Thanks anyway, but grinder it is then!!!!