In james a Harvey's book machine shop trade secrets page 182 fig 8-6 he speaks of using a single pointed threading cutter inverted so that it is upside down and runs the lathe in reverse and cuts from the headstock toward the tailstock can anyone enlighten me on the procedure and it's benefits I understand one is removing the problem of stopping the machine accurately before you reach the undercut or non threaded portion at normally the end of a cut are there any other benefits?and is this normal practice seems like a good idea if it works Alistair