Just a little update to this thread:I think (hope) I've now fixed the escaping spring issue. I made it pop out as detailed before, and bent it right over towards the centre of the tool with a pair of pliers, and coaxed it back into the slot with a small screwdriver. Hopefully this has cured the problem, and hopefully I've not weakened the spring. I should be able to let this into the rotation now, and see if it proves itself as a capable/reliable tool. I just need to consider what to pair it with