It appears that the Adwest steering box was used in the Repair Parts Scales so can I assume it was fitted to the first run of Perenties.
No reference could be found as to when the Gemmer steering box fitment began.
Confusion seems to be rife as even the British vendors using NTC8224 for both the Adwest and the Gemmer.
A study of both diagrams seems to allude that little if any parts are interchangeable. (verification needed…)
It also appears that the Adwest has a larger area supported by needle rollers.
I cannot reference why the Gemmer steering box was introduced. Was one a better bit of kit ? Or was it supply chain? (verification needed…)
I seems you are a rare individual if you have rebuilt both types and I would welcome your thoughts. Or if anyone can share some knowledge on the subject.
Keen to know if the ADF overhauled internally or who the contractors where.
I now have a collection of both types with some needing to be rebuilt and looking for a direction to take.
All the best everyone for 2020.
Thanks Phil
Top image is the Gemmer.
Bottom image is the Adwest.