On the penturning forums, I am well known for getting passionate (to phrase it politely) over suppliers requiring use of weird, non-standard drill bit sizes for pens and other small projects. This requires purchase of expensive and low quality drill bits before one is able make a new style pen or other project. Another such issue came up the other day. Below is what I posted on a couple pen forums.
BTW, the way I feel about this is:
More weirdo drill bit size rant material came my way the other day.
A friend is wanting to make some decorative holders for votive style candles. He has the cups for the candles and wants to set them in wood. The cups require a 2 1/8” hole.
I searched my Forstners but only found a 1 15/16” and 2 3/8” as closest sizes. Neither would work. We tried a hole saw at 2 ¼”, still too sloppy.
We finally settled on an adjustable auger that I had modified for power drills. He will further modify by grinding off the threads on the pilot.
Bottom line is this is the last time he will make this type of candle holder.
I think the suppliers believe they are keeping customers by requiring purchase of these weirdo size bits. In this case, about $40.00-$50.00. But, the reality is, they are dissuading new customers from trying these projects.
BTW, I found this set at Harbor Freight.