Simple bench power supply

I have made a little 'suitcase' with some necessities for working with electronics;
soldering iron, helping hands, small multimeter and power supply.

To provide a voltage to projects, i use a DC-DC stepdown converter (also 'buck' converter).
The stepdown converters are supplied with 24V so i can can set the output to 1..24V DC.

The stepdown converter for this project; search for "LM2596 Step Up/Down DC-DC Converter Power Module With Digital Display"

It features a pushbutton which enab