Yup, cereal box is good, and cardboard from the back of a notepad too. I always write "NFG" where there's a problem rather than an X,
You don't have a lathe?
Found them $6.61 each 3/8 x 1/2 Arbor BushingSure I have a lathe! But my time is worth more than $10 P/hr
I could make a screw driver but I would rather buy one.