I admire your tenacity with the timber blocks Neil !!!!
I would recommend a harder timber, they will last longer and they will be less affected by changes in humidity.
I knew they would annoy me so I ordered some delrin ones from Cut To Size Plastics in Sydney. My blocks are 82x52x45mm and cost $6.05 each including GST. They are easy enough to drill but you do need a drill press and a TCT Forstner bit.
Keep the pix coming !
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