Could you give us a picture of the mechanism that slides in/out? There are only a limited number of ways of putting something mechanical together, so we might be able to spot the
repair needed even if the pedestal is not recognized.
OK. Old guy wants to tell a story. In my first semester of engineering
school (1964) we had a shop class in which we were required to construct a little
aluminum paper weight that had in it every possibility for manufacture - threads, cut gears, milling, lathe turning, etc. The point was that we not thereafter design something that could not be built in the shop.
Expressed another way, our tools dictate our structures. There are, indeed, only a limited number of ways of putting together a
helm, shaft, and
gear sprocket, and only a limited number of ways of generating 1/2 inch of longitudinal play in the shaft. You can look at it and say something like "There has got to be a loose shaft key in there."
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