Due to the density on the LM317 module circuit board, the fitting of securing screws through the two available 3.1 mm holes is potentially problematic. There is also a potential for shorting on the soldered pins under the board.
Andy R
I designed a holder in Sketchup that resolves both problems.
The hollow area provides clearance for the soldered pins and two holes are provided for securing to a baseboard. The module simply clips on to the two plastic pins. If anyone is interested, I can send you the .skp file and/ or the .stl file if you have a 3d printer.
Here is an image of the completed unit alongside my almost completed freight yard.
Might be able to print a few for those without printers
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