I also realised that the square section was also slightly undersize and was rattling about slightly in the infeed hole
Homemade jig for making your own custom dowels.
Shop-made Doweling Jig-great demo on how to build and use this version of the successful Rockler design
Self centering drill guide.
Cross-dowel drill jig.
This is a quick project that can be done in less than an hour. All you need is a couple of scraps of wood and two bushings, which can be found at almost any ...
Dowel Making Jig - The Woodworkers Institute
Dowel Jig simple. Could be improved with bushing inserts and sleeves from lee valley. A brad point drill bit the same size as the holes can be pushed by hand into any hole to accurately mark the center line.
1/2 Dowel Rounding Planes- !R12 - The Japan Woodworker Catalog
Trying to eyeball the exact center of anything is a bad idea, especially when you’re working with dowels. This DIY dowel center finder is cheap and easy to make, and works like a charm.