Stepdown Radio - tuning gets stuck

ernie28

The radio in my '50 Pacemaker has an issue with the tuning mechanism. By the tuning knob it will go up to 13 but will not progress to 16. I have taken the radio out of the dash and looked at the mechanism. The "friction clutch" slips when it gets as far as it wants (to 13). You can gently pull the tuning bar and it will go happily to the top of the range but there is a mild scraping sound like there is unevenness with one of the moving parts. Any tips to help resolve the issue or increase the pressure on the "friction clutch"?
I am not a radio expert and I do not want to disassemble it further as apart from this it works fine. I have set a pre selector to 1600 and can wind back down so that may have to do. Would be nice to have it working properly via the knob.

I appreciate any useful input.

schillaz

Here is some info.

ernie28

Many thanks