For testing and calibration needs, I need to install several precision axial resistors. I decided to use the 4mm banana plugs ordered from Amazon. The first challenge was to accurately calculate the dimensions of the banana plugs. Then, I designed a two-dimensional layout for the installation panel and the accompanying fixing box - the design accommodates two usage methods: it can be directly connected via the banana plugs, and the panel can be flipped to directly access and operate the internal resistors.