CR620 dial cord slips
- Thread starter SteJul
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I try and stay away from receivers...
Reads like you have replaced the cord possibly with one that doesn't meet spec, so the stringing diagram shown in the service manual(below) is only guidance. You need slightly more tension in the cord, do you think you can get a fourth turn around the flywheel??? Probably not. Another approach is to slightly increase the diameter of the flywheel where the cord wraps (3 times). Again a "re-sleeve" using tubing would probably be too great, thinking a better approach would be to use 3-4 turns of teflon tape or... (the cord would probably cut the teflon over time??)
edit maybe a coating of nail polish on the flywheel shaft??? I'd try the teflon for better grip.
Reads like you have replaced the cord possibly with one that doesn't meet spec, so the stringing diagram shown in the service manual(below) is only guidance. You need slightly more tension in the cord, do you think you can get a fourth turn around the flywheel??? Probably not. Another approach is to slightly increase the diameter of the flywheel where the cord wraps (3 times). Again a "re-sleeve" using tubing would probably be too great, thinking a better approach would be to use 3-4 turns of teflon tape or... (the cord would probably cut the teflon over time??)
edit maybe a coating of nail polish on the flywheel shaft??? I'd try the teflon for better grip.
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I thought the "standard answer" for getting a little more traction from tuning cord is beeswax. I'm afraid I haven't used it myself, mainly because I don't know where to get it. What I have used, with good success, is automotive "belt dressing", but I don't know if you can still get that at auto parts stores.
I am going to give beeswax a try. Belt dressing might be a bit too messy. Thanks.
They seem to have several types. You've found one that is suitably NON-stretchy for use as tuning cord, I take it. The polyester, maybe?
I forgot which one but it worked .
I don't know where i have the remainder of the spool in my mess of a work shop.
I have some .028 vintage radio dial cord
I did find the dial cord. 
You aint seen messy.
I did find the dial cord. 
ConradH
Lunatic Member
I would not use belt dressing as it's too "heavy duty". I've used bee's wax but don't like it very much because it's too sticky and you lose the flywheel effect. Be sure the cord and all pulleys and shafts are completely clean and free of grease and fingerprints. Use 91% IPA (not the India kind). I've found window blind cord works well for the heavier dial cords. Not sure what's the best for finer cords, other than dial cord. In a jam I'd probably try a very heavy button or maybe canvas thread.