Mike i agree with you, Yes it is a VHM and is the same as mine. The biggest worry (and problem) was the Fibre gear wheel which was driven by the motor pinion and turned the main gear box.
I chewed up two of them. The motor pinion was something like 24DP (calculated) and the fibre gear was about 26.4 (something) DP (calculated). I do not know what Warco did about them as after the second failure in about 10 months i was a might fed up.
So in the end I fixed the joker. I made a plate with a spindle (to replace the Motor) with a slot in it to get a telescope gauge in. I averaged out a dozen or so readings. I then wrote a program to search all the DPs and Modules in a well known gear catalogue (Helical section) for the best fit at about the right ratio. Bought the cogs, fitted them job done. Ok she is a bit slower than the original andshe used to ‘ring’ a bit but now 18 years later she purrs like an old fat cat in front of the fire on a cold winter’s day.