We had a spate of Marina steering column lock failures and this might help. As you say without power its a bit of an issue but if you can get a rechargeable drill in there with a 1/8" or smaller drill bit and try and drill a small hole as close to the edge of one of the shear bolt cone shapes as you can. I used to rest the drill side on the clamp with the recessed holes as it does not matter if its damaged a new one comes with the new lock assembly anyway.
When you have a small hole use as fine a centre punch as you have to try and tap the bolt anti clockwise, might sound daft but they do come undone as they shear at a very low torque. But before you try please read the killer dodge below ;-)
Get a pair of large mole grips and clamp both halves of the aluminium clamp together, you can just get onto the edge of the clamp halves one side at a time. This clamping takes most of the resistance off the threads and from under the shear bolt head and you might find if your lucky that the bolt is almost loose.....I have certainly had them where I could just push the shear bolt with the centre punch. I have even see (not much use to you without power unless you have a cordless one) a Dremmel used with a cutting disc to cut a slot into the shear bolt 'cone' obviously through the clamp half as well but as I say its scrap anyway and then a screwdriver hammered in to widen the slot (its very soft metal) and then they can be screwed out once the mole grip is on. Its normally only the first one that's tight. Good luck, its not as bad as it seems to do.
Last edited by Spanner Juggler; 26/02/16 04:18 PM.
