As Lynn recalls, correctly, the TL 1623 and TL 1624 (or CTL) rings are located on either side of the double bogie assembly. The outer one is quite obvious, however, the inner one may be lurking close to the leather dust excluder. If it is not rusted in place, you should be good to go. A touch of heat and some lube works wonders. Don't forget to remove the leather dust excluder wiring!
There is no need to remove the TL 1613 cross tube rollers when re/re the cross tube. The procedure is published in the British AOP maintenance manual.
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