Nah. Have a crawl round the online microfiche. Ill bet the leg & clamps are shared between two or three sizes of motor, one of which will have pt.
Then its "just" a case of finding one in a breaker's yard & swapping bits.
As for the 70s one being crap, mine is loosely based on that vintage, and having dragged it kicking & screaming into its final 1989 version it should now be quite reliable. Quite a few major changes to the 70s version.., and not just the cowl.
Feel free to quote me on this when it blows up!
Edit- Nos, this simultaneous posting is getting silly!