Mount 1.5-inch Schedule 40 PVC pipe (which has an outer diameter of 1.90 inches) to a flat surface with the PVC Table Mount via its three tabs with countersunk holes for hardware.
Three kits are available:
Mounting a Mullet Boom Arm to a wooden workbench top
Mounting a Mullet Boom Arm to the Mullet StabilQuad Base or adding an accessory