nmo probs, Mike.......I have to say, I don't doubt Lance at all, but I speak from actually seeing them also with exposed shafts, and as such we probably have the two sides to the same story......However, for modelling purposes, it's far easier to run exposed shafts from the stub of the prop tube to the A frame, than it is to run a two size tube with a shaft inside, for the object of Purity and the purist.
As you say, lifeboat development went a long way in the 20 century and I conceed that Lance has that configuration on his boats down at the Chatham museum, but it can't be said that all boats had that configuration, just as it would be wrong to say that ALL 41' watsons had a capstan on the deck midships starboard side of the main cabin.......I think I have only ever seen the Ann Letitia Russell with that capstan, and as such it would be wrong to say that No 41' watsons had a capstan on deck just because all others didn't.
There are many vaguries and differences on the same class of lifeboat. Take the 44' Waveney for instance......no too were the same, The Fleetwood boat 44-015 had her forward fire fighting hose reel on the opposite side of the cabin to most other boats for some reason, and this can also be said of all old AND new boats, and as such no hard and fast statement can be made about any boat. It was probably down to the yard that built each seperate boat, as there were a number of boat builders for lifeboats around the country.
That is why I said in my first post on this topic......Research into the boat you are modelling is paramount in all cases
neil.