Brush Size

I have a brush handle that I've turned and I'm ready to add the plug. The problem is they all seem to be measured in millimeters and I don't have a metric measuring tool How do I know what size plug to get?

Worst case, use a mm to decimal or fraction converter in the net. When you do bore the hole keep in mind the knot sizes are usually measured at the glue plug so the hole should be 1 to 2 mm larger than that.

Bob

If you want a real tight fit, bore to near size wanted, then when get knot measure at desired height on knot to get the loft you want, match bore to that measurement.

Thanks for your advice. Much appreciated.

1" =25.4 mm , and a calculator s all you need to figure out your dimensions. You need to take into account that you will sink the knot deeper than just the plug so you will have to drill a larger opening accordingly.

What diameter hole is drilled in the handle?

Usually I do test boring piece of wood to get the proper drill size. You can fit the knot down in there to the correct depth that you would like, then I bore the piece of wood that I'm going to turn for the handle and I mount it to a mandrill on the lathe. Forster bits are prescise, but it's wood, so there is always a little wiggle room...