ORIGINAL: JollyPopper
I suppose there are many people who just start an engine and go fly assuming the engine is still in tune. I just don't so tuning the Tower .46 is no problem.
I suspect that you live somewhere where the temp & humidity don't change markedly -- that bothers the Tower 46 a lot -- including the low-speed setting. Most everyone adjusts their high-speed needles -- but who wants to keep tweaking the low-speed needle?