There is a hacksaw blade that is round and will cut in any direction that you apply pressure to. It cost about $13 and is 2mm thick so it will cut out a lot of material and the going will be slow. I have used in the past on my SGM-1 build head stock and a long forgotten LP build and on both the job was done on the Mahogany in close to an hour. Quite useful for odd shape first cuts though you need to keep an eye out for tear outs on the back of the job as it is a quite coarse blade.