Heathkit SB-10 Series Troubleshooting Manual page 79

I did the complete fill of the pocket because I wanted the area with cracks in the
transparent pocket to be reinforced by the J-B Weld. You could avoid the need to
machine out the fill for the pinch roller drive wheel by just using a round cylinder form
around the hub that leaves at least 3/4"-wide clearance band at the outer edge of the
pocket, and just fill the area between the hub and the inner side of the cylinder form with
J-B Weld. Just be sure the fill doesn't extend beyond the hub bearing surface for the
plastic index cursor. A plastic or metal cylinder form would be OK, and you wouldn't
need to use a form release compound if the outer diameter of the cylinder gives you the
needed 3/4"-wide clear band at the outer edge of the pocket. ALSO.......if you use this
technique of a partial fill with the cylinder form, YOU WOULDN'T NEED TO REMOVE
THE STEEL RING FROM THE DIAL (secured by the 4 thru tabs).
Sorry, but I couldn't figure out how to include a picture of the filled dial pocket.
Depending on how badly the dial has been damaged (cracks in the transparent pocket
area), you may want to smooth any rough edges on the backside of the pocket which
has the spirally grooved tracks, so the nylon stylus pin tracks smoothly (without hanging
up) in the spiral groove on the backside of the dial. I used 800 grit cloth to very lightly
smooth the outer surface of that area, and the spiral grooves themselves.
The finished dial works smoother than ANY of the many SB's that I've had, and will
outlast the rest of the radio many times over. The procedure sounds complicated and
difficult, but it isn't really. It's just harder to explain than actually doing it.
BTW......forgot to mention:
DO NOT use the J-B KWIK (quick setting), since it sets up in under 4 minutes, which is
way too fast for a task like this, and doesn't fill all the voids as well as the normal slow-
setting epoxy or J-B Weld. And, of course, all surfaces to be bonded by the J-B Weld or
epoxy should be prepared by thorough cleaning/degreasing, and "roughed up" for best
adhesion.
Servicing Procedures Page 79