I inherited a well built garden shed from a pensioner who was moving into sheltered accommodation. Unfortunately it was not built to be taken apart and so in the rush to move it some of the major wall sections had to be prised apart and this has left exposed screws with the heads still captive.   I do not own any cutting tool and want to buy something to slice off the captive screws flush to the wood surface. I think my options are a small grinder or an osculating cutter, these have po