Hi A Irwin, going to the trouble off fitting a reverse switch may not increase its value by any significant ammount. You may be able to recover the cost of doing it depending on what monies you spend on such a switch. You could put something like this self contained switch/no volt start/stop **LINK** but this particular one doesn't have a box, so you would have to source or make one to suite.
Arc Euro do a forward/reverse switch among thier lathe spares, which you may be able to fit in the original front location of the lathe http://www.arceurotrade.co.uk/Catalogue/Machine-Spares/C4B-Bench-Lathe-Spares
As Bazlyle says the leadscrew is premanently engaged, so a reverse switch would be an advarntage.
Clive, I would think that you are likely to find more lathes with a reverse than without one.
Regards Nick.
Edited By Nicholas Farr on 12/06/2014 07:42:35
Edited By Nicholas Farr on 12/06/2014 08:18:24