Here you go Bill.
Down the X axis I have several locations where I can put these blocks. I got the exact location where the left end of the block goes by v-carving a shallow line. I then drilled the holes along the side and built the blocks and put in dowels and sanded them so the fit is quite snug. It has worked really well so far.
My plenum (with the holes) is baltic birch not MDF. My thinking is that MDF might be too soft and the holes could increase in size from inserting and removing the pin blocks.
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