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I had a similar situation with a National NC-121 shortwave receiver.
There are two things to try.
First, make sure that any bushings or friction points where shafts turn are very lightly lubricated. You definitely don't want any oil to migrate onto the dial string.
Second, you want to make the string not slip on the shaft. You mentioned rosin. I've had good success with violin rosin. Take the small block of rosin, put it in a ziploc bag, and give it a whack with a hammer. Put some of the powder in a small dish with alcohol. When it's dissolved in the alcohol, use a q-tip to dab some of the solution on the string and on the shaft where the string makes contact. Give it a day or two to dry up, and it should work pretty well.
If neither of these make the slippage any better, you may have a dial tension spring that is too weak. If that's the case, you can replace the spring, or retie the knot where the dial string connects with the spring so there's a little more tension.
Hope this helps!
Good luck,
Clay
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