I have just invested in an old Rapidor power hacksaw (one that takes14" blades), and it is basically sound except for the spring loaded lever assembly that engages the drive pulley. I am afraid the spring broke so farmer joe got his welder out and made nasty repairs (really truly nasty!!).
He also had a go at the (single phase) electrics and bypassed a Dewhurst switch which I discovered tucked under the bed. But why would you want a reversing switch on a power hacksaw, surely thats not original?
If anyone out there has a Rapidor I would be interested if they can shed some light on the drive bits, and also it would be handy if anyone knows if they had a saw-activated electrical cut-off - via Dewhurst or otherwise. In fact any info would be more than I have now.