First attempt at drawboring today. Long story short, I don't think I used enough offset because inserting the dowels did not close up the gap in the joint nearly as much as I expected. The tenons are about 2-3/4" x 3/4" and I used 1/4" dowels with 1/16" offset. It's red oak.
On a side note, apparently some folks think the dowel should be pretty close to the tenon shoulder. I placed mine halfway up the tenon cheek because I didn't think it mattered. Does it?
When I dry-fitted this mortise and tenon before glue-up the gap was pretty tight. Not perfect but as close as I can usually get. After glue was added this was the result:
IMG_0462.jpg
It isn't terrible but it's noticeably looser and the drawboring didn't seem to tighten it up any more. Did I just not use enough offset and should I have used bigger dowels?