Firstly I found that making and fitting the mechanisms was not too difficult. Secondly, during this process I checked and rechecked their range of movement to make sure they operated as I intended - and they did. But (you knew there was going to be a 'but'!) once you raise the wheel to the vertical position in which it will run and allow the mechanisms to take up their natural position under the influence of gravity, it's then you discover you haven't got it quite right!
The mechanism has to do a certain thing at a certain time and getting that right is the hard part - I understand why Bessler complained about his own difficulty in setting the mechanisms correctly in his two-directional wheel but that was more complex than the single-direction ones. It tells me that he was a much more highly skilled engineer than I am.
Part of the problem lies in the way the various parts of the mechanism interact with each other. In my case I have a two foot diameter backplate on which to attach the mechanisms, but they take up approximately two inches of depth - I mean that they stand out from the backplate about two inches. I have redesigned them or rather rearranged them so that one lever is now operating under another one instead of over it and this has meant that I have had to increase the height (depth) above the backplate of the weight. This does seem to have improved the action of the mechanism so I continue.
I know this is difficult to comprehend without a drawing but I think you get the picture - it's proving difficult but not impossible to complete this project and definitely taking longer than I thought it would.
One point occurred to me; Karl's reference to a carpenter's boy suggests that the mechanism was made entirely of wood other than the weights? So the levers etc would be wooden rods I presume. I always imagined that it would have steel or rather iron levers.
JC