Bench Power supplies with analogue pots without centre marks so you can't see where the pot is set.

DC Bench Power supplies with analogue voltage & current setting pots without calibrated centre marks on the knob so you can't see where the pot is set at a glance - I was always going to replace the knobs or 3d print some replacements but I'm time poor so lets add some centre markings to the existing knobs to fix this problem - turn the pots fully down mark the left most setting with pencil on each pot and turn the pots fully up and the pencil mark should be an even 0-270 degree angle and match the right most setting - use a soldering iron to melt a notch in each pot and fill the notch with nail polish...