Step 6:
The next operation is assembly of the rails. First assemble the 16mm rail to the flat bar using M5 x 25 bolts with the electrical stand-off spacers between them. The spacers have an internal diameter of 4.3mm when you buy them and will need to be reamed out to 5mm using a suitable holder in your bench drill. I found it particularly easy as I was able to use my lathe to centre drill the spacers with a 5mm drill.
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