I have a collection of medium old (in my opinion) radios such as a ts-440, ft-920, ft-840 and on all of them the vfo/tuning knobs are very stiff and "stutter" when turning. These radios have been in storage for a long time though they otherwise work.
- Should I lubricate the shafts?
- How can I adjust the tension?
- Is there anything I should be careful of before removing the knobs?