Jazz bass Mod becomes Build?

Amazon delivered a 300mm x 4mm drill bit today. It was very impressive the way the stainless steel sleeve stabilized the angle. The slop has dropped from about 6 degrees of play to about 1 degree of play. That seems pretty acceptable. I managed to get it two ways.

One of the two 6mm guides they sent is worse than the other. I'd throw the bad one away, but maybe I'll drill it out to use with a 1/4" bit.

I got the 1-degree-of-play with the 4mm bit first by using the better 6mm guide with the stainless steel sleeve.

I also discovered discovered I could get pretty much the same using the 8mm guide. In this case I used the stainless steel tube and then the plastic shaft from a Bic "round stic" pen.

Attachment 46032

I noticed that the shaft OD is exactly 8mm and the ID is 6mm. It worked great. Not really necessary since at least one of the 6mm guides to work, but interesting nevertheless ;-)