I also have an telescopic/adjustable steering wheel assembly on my TR3. My understanding is that the grips on these wheels were made of a different material than the standard ones and were prone to breaking. The metal inner ring in my grip broke and came apart as I was driving. Scary!
I plan to have the wheel rebuilt (
https://www.pearlcraft.com.au/welcome.htm) but in the mean time I have replaced it with a period correct 15" Moss brand "Touring Wheel" (489-080). You will also have to get a new
adjustable Moto Lita hub, also supplied by Moss. (sorry I dont have the part number)
Note:
-The Moss brand of adjustable hub does not accomodate the TR3 horn assembly. The set screws that secure the horn assembly in place do not fit over the metal disc that slides into the stator tube. I learnt this the hard way as they shipped me the wrong one, and I spent quite a few hours taking it on and off (not fun if you have ever tried this) before calling Moss and speaking to a technician. The hole in the steering wheel is also fractionally too small to fit onto the hub and had to be enlarged with a file. No big deal.
-The adjustable hub is secured inplace on the steering column by two bolts rather than a collar as on the original wheel. Also no big deal as once installed I have not needed to readjust (see picture)
-If you get too large of a steering wheel the grip may be closer to the dash than you are comfortable with, as when fully pushed away it is 2" closer to the dash. I think 15" is ideal. A little smaller than the original but still big enough to pull the wheel around. Attached are two pictures of the set up. Hope this helps