I used Abingdon when I restored my last TD. I recall they were in Mass. then. I even visited their place of business to pick up parts. In re the TD clutch - my recollection was they had a limited travel and engaged abruptly. Anything you could do to make a smoother engagement would be an improvement. One big advantage of these old cars is that you can improvise. At one time I was a member of an MG T website or Register. It may still be available.