Found this very well designed USB / SD Card / Micro SD holder in a compact form for the ikea skadis peg board by “chilman408” but nothing similar for the HSW tool board, so here's my modified version.
This is a remix of another authors model, I just modded it for HSW mounting, but if you would like the slots a tighter fit, then all you need to do is play around with the scaling settings within your prepare section of your slicer, ie: make the x & y axis 0.2mm smaller ? trail and error.