I´m currently servicing my AVO CT-160 Tube Tester (works fine) but I have a big problem as I don`t know how to remove the knobs.
The manual says:
"To remove any knob, remove 6BA screw and spring washer. To remove knob spindle and skirt, release locking pin. .........................."
This sounds fairly easy but whatever I do and which knob I try, there is no chance to "release" those locking pins.
All of this pins fit so tight like they seem to be welded into the knob spindle.
I tried to insert fine oil and with a small hammer and a "snap through" (don`t know if this is the right word).
This damn pins just don`t move...
I did not want to beat too hard because I fear about damaging the meter.
I tried to heat the knob spindle - again nothing.
If those pins don`t come out I can`t remove the knob spindle. If I can`t remove the knob spindle I can`t get access to the switch nut and without this I can`t remove the switch or pot which is underneath the chassis.
Usually I get this sort of things done one way or another but in this case I seem to be lost and about to loose my patience ....
If anybody out there could help me it would be very appreciated.
Maybe there is a special trick....
attached a picture of the knob with the upper part already removed:
The manual says:
"To remove any knob, remove 6BA screw and spring washer. To remove knob spindle and skirt, release locking pin. .........................."
This sounds fairly easy but whatever I do and which knob I try, there is no chance to "release" those locking pins.
All of this pins fit so tight like they seem to be welded into the knob spindle.
I tried to insert fine oil and with a small hammer and a "snap through" (don`t know if this is the right word).
This damn pins just don`t move...
I did not want to beat too hard because I fear about damaging the meter.
I tried to heat the knob spindle - again nothing.
If those pins don`t come out I can`t remove the knob spindle. If I can`t remove the knob spindle I can`t get access to the switch nut and without this I can`t remove the switch or pot which is underneath the chassis.
Usually I get this sort of things done one way or another but in this case I seem to be lost and about to loose my patience ....


If anybody out there could help me it would be very appreciated.
Maybe there is a special trick....
attached a picture of the knob with the upper part already removed: