Allan, as you probably are aware, Rimmer Brothers lists the squirrel cage conversion in their online catalog, and just as quickly shows it to be not available. They do at least show a picture of the unavailable little jewel. For the life of me I cannot see how a directional fan blade can be substituted by a non-directional squirrel cage. But then again, I still don't think they ever really landed on the the moon. I was fortunate enough to find a brand new, NOS Bakelite fan blade on Ebay (with the help of a forum member) and successfully install it on my new TRF fan motor. (I can write a whole page on that subject) The other option, if you cannot figure out how to build your own squirrel cage conversion, is to remove the fan from another heater. There are, however, two great mysteries in life: Where is the Ark of the Covenant and how do you remove the fan blade from a motor shaft without breaking it. (hint, it cannot be done) Why not drop Rimmer a note or better yet call them. On more than one occasion I have called the UK and gotten anwswers to Triumph questions rather niftily. (they don't know where the Ark is either, though)
Bill