Yes, M20x1 Extra Fine thread are the nuts needed, finding them local could be a bit of an issue. Order online I guess. locking the nuts together will work, takes a bit of an effort to get it moving the thread-lock does its job! Heat helps it let go.
The Suck, Squeeze, Bang, Blow Moderator
I use a piece of 5mm thick rubber sheet around it and molegrips (or vice if the engine cases are stripped) to clamp the rubber tight. But before that I heat it up with a torch to soften the Loctite.
Then after removing it I then use a 3/4"-16 BS Conduit Tap covered in grease to remove the remaining Loctite and stop it staying in the main oil gallery.
If you fitting the TLR heat exchanger then be careful as the early TLS oil filter flange on the cases isn't big enough diameter to cover the heat exchanger O-Ring seal.
You can make a large 80mm diameter metal disc with at least a 30mm diameter hole in the centre with gasket paper on the case side to make it match and seal
But also be aware the TLS and TLR starter motor alloy end castings are slightly different profile shape and the early TLS starter motor hits the TLR heat exchanger......
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Thank you for the input, i'll bolt up this weekend, and see if I have any issues. Did not know that about the starter motors, have to look out for this. Its not a 97 model so should be OK.
It's on, you are right the starter motor is close.