However, when they eventually get worn enough they can also be expensive to rebuild.
Indeed. And when a tracker touch goes sour and the roller boards get stiff... it's an absolute bear. You can perhaps limp along without as many siphons and dead notes, but your day will come too.
(And for the record, trackers use leather at the valves to help create the seal; it just doesn't have the same pressure behind it. But if it dries out, it can cause problems too, and it will eventually need replacing.)
Can you elaborate? This, in my experience, takes like 100 years to happens. Seems a good investment. Releathering reservoirs, etc., isn't a bad job at all.
The long and short of it is that you have to evaluate each organ individually. Some are good, some not so good and that is not always dependent on type of action.
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