My harry uses push bike cables from wilko at 99 pence each to drive it - you can buy self tightening nipples from a push bike shop and make your own cables up,
Its simple and it will keep the best mower that money can buy (harry) running
PS failing that a company called active have started to remanufacture harrys under the active name they are relativly new but should be a good source of spares when all the numptys realise there is only one mower suitable for the english summer and they start selling loads
Good luck
billy bob
December 2010