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It's also worth looking in to where the slippage is actually taking place.
It's near impossible for the sprocket on the post to actually turn the worm
gear on anything greater than a 4:1 ratio. Those are probably 12:1, and if
anything is actually slipping it would likely be the shaft to sprocket joint.
If you pull out the screw you will probably find either the sprocket
sheared on the inside edge (I don't recall if those shafts are toothed or
flat) or the end of the shaft stripped. In any case, tuners can usually be
repaired. In the above case some thin brass shim stock to tighten the
joint can sometimes be enough. If not, peining or even keying the shaft/
sprocket can often be done while keeping it hid neatly under the screw.
Your description of a "cam" feel would lead me to believe that the
sprocket is perhaps stripped inside and now off center, in which case
shimming on the appropriate side could help.
The journals that hold the worm gear / key shaft can also come loose,
and can typically be peined from the underside to resecure them. My
point is that most of these old tuners are relatively easy to service, and
can often be repaired rather than replaced. It's a relatively simple
machine, and you just need to figure out where the slipping is happening
and go from there. Sometimes it can be as simple as tightening a screw,
although your case certainly sounds like a little more than that.
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