Here is an alternate version of Ken Rogers address. I can't say which is correct. However, a telephone number was included as a part of the info. Ken Rogers 71 berkely Ave. Cranford, Hounslow Middlesex TW4 6LS tel +44-181-897-9109 This info was dated 1997. Holdsworth also sold a trike conversion kit in the early 70's. I don't know who made it.
Paul Patzkowsky