I don't know why Lewmar doesn't sell a new self tailing kit for the standard chromed two speed Lewmar 30 winches, of which they have sold millions of in the last 30 years.
Probably because they want you to buy their all new self tailing winches instead. I seem to remember a blue ring type self tailing add on that they used to sell in the 80's era.
I also used to think my Britsh compatriots were as frugal & penny pinching as I am, but I guess Lewmar is just about making money, like everyone else is these days. No one even wants to service or upgrade the old stuff anymore. I've thought about getting my old winches re-chromed, but then I decided to just wait till I get the money for new self tailers, or maybe just buy a newer boat one day!