Ray- The wiper motor is the only instance I can think of in the TC where a "duplex" wiring scheme is used. The positive and the negative wires each have a poly insulation (red and black) and both those wires underneath the poly insulation is a (small gage) solid copper strand, nearly identical to ol...

The box is billed as being a heat shield. It contains an asbestos sheet insulator on the side near the exhaust. I have seen several T types for sale recently with the box entirely omitted, which I think is a poor idea for the reason you mention about stones, etc. I run my TC with the box, but no asb...

Looks like Franz shows one good spring, and another spring broken into two pieces.

Franz- A common mistake regarding the rear bearing is to simply re-assemble as it was taken apart. The paper "gasket" is more than a gasket. Really it is a shim. The rear bearing "clamp up" must be very precise. When the car left the factory it very likely had a paper gasket. Through wear and tear o...

Carl-
A stock and un-modified TC steering box requires NO machining to take the rubber seal Steve mentioned-- National #240735.

If grease is used, there will eventually be no fresh lubrication between the top of the sector shaft and top plate. With gear oil, each time the steering is turned right or left it sloshes oil waves to coat the top plate with reservoir oil-- which then gets between the top of sector shaft-end and ru...

When a stock TC steering box is properly rebuilt with a correctly manufactured worm, the sector shaft will rise up slightly at center steer and "rub" against the top plate (only at center steer). That is why the top plate is often called the rub plate. Defective worms are unfortunately very common i...

On the stock steering bracket there are four bolts. The upper bolt holds the box to the bracket and is designed to be installed with the head of bolt facing out--opposote of what you show. If the nut loosens and falls off, the bolt will only be able to back out just about an inch before it hits body...

You are right on the pistons. They do list rods and +020 and +040 rings as in stock. There are some TA people here.

Doug Pelton with "From the frame up" in AZ seems to have pistons and rods and some other internal engine parts for the TA. I do not see a crankshaft. The online catalog has gotten easier to use, and you can filter to only include TA items in each catagory.
https://fromtheframeup.com/

Do a search of the name and address and you get a list of British Gliding Association inspectors under the alphabetically listed "ordinary inspectors." His name and that address. Probably his home address. List from 1977. Page 2 of ordinary inspectors. Maybe he ran an export company out of his house...

When the spindles and the hubs are on the correct sides, the spindle nut tightens in the opposite direction of the knockoff. It all makes sense.

Doug Pelton has a copy (172 pages) to view online at FTFU website. Also TA and TB spec.

https://fromtheframeup.com/pages/mg-factory-manuals

When I rebuilt the box I used the original worm, so it is on the car. Likely the original peg pictured. It did match up to the new peg I installed. Using a digital dial caliper I got the shaft that presses into the sector shaft with a slight taper. .439" tapering to .449" (diameters) The angled peg ...

Did the car not come with a worm? Or, what is perceived to be wrong with the old worm?

Bob- Note that my comment above about "unwise noise while cruising in 4th" with 90W oil has nothing to do with synchromesh function. I have tried several brands of multi weight 140's, plain old GL4 140W, and the MTL (90W) that clearly is inappropriate. The synchro's worked quite well with each type....

If you are going to carry a bunch of spare parts, etc around in a TC you will run out of room pretty fast. The TA and TB had two big lead/acid batteries behind the seat-- beneath the differential cover. A good place to add storage in a TC, as the battery is up front. Two designs on the resources sec...

Redline makes great oils, but you do not want to use 90 weight in a transmission that calls for 140 weight. If you try 90 weight in the stock TC transmission it will make unwise sounds while cruising in 4th gear.

Greg-
The later TC RF95/2 #37057 box has different windings numbers from the RF91 you reference. The RF95/2 #37057 is also different than the TD box you describe, designed for a different dynamo. RF95/2 #37057 produced in 8/49 and fitted to TC9866 (production date 10/49) has 2 and 4 windings.