Step 11: Right Side Hole
Thats how u measure it just drill the hole and hopefully it will come right in between the bottom groove.
When the hole is drilled and cleaned shove that spool right on in there and make sure it fits.
To make the knob do the same exact thing except use a 5/16 drill bit.
Once the top fits securely, light proof the hole the same way with the leather and fabric, Except only put leather on the outside of the hole not the inside there is nowhere for it to go.
When it is all dry cut the hole put the spool in and glue the knob on and you are done!