U-shaped booth repair

[Geech]

I use M size bobbins.  Take a pen or sharp pencil and stick it in the hole and run the bobbin around the seat bottom and your pen mark will give you  1/2" seam allowance.  I have been doing this for over 19 years.  It saves a lot of time

I did that too, till I found this-

http://www.leevalley.com/en/wood/page.aspx?p=50272&cat=1,42936,50298

I love both ideas - thanks for sharing.