I think your starting alignment is significant. If, for example, you keep lining up at the waterline to start with (when activating the stad), and then put the second black bar to the top of the funnel, you will get a consistant result.
The problem I have is finding where I need to align both black lines, as it were (the original, for the starting alignement, and the new one... waterline to top of mast does not seem to work).
Itkovian
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