My dogs are 1” wide and 1.5” deep. To simplify the height holding mechanism I used double sided adhesive foam tape to hold the filler piece. The foam is very dense. Never seen anyone do this. It works beautifully, even after years. By having this on the side of the dog it’s holding power is not compromised, it is also very simple to do.
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The dog are 2.5” on centre from the bench edge. Boards 5” wide are held in the middle. Three dogs well spaced along the back of the bench next to the tool well for very wide boards.
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Having the dogs lean into the holding 2 or 3 degrees keeps the pressure holding the board down not pushing it up.
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While round dogs are very simple, the reduced contact area for holding is not ideal. Stout oblong dogs are stronger. When you look at all the work that goes into a bench having a great row of dogs is worth barking about!
You can do a lot with very little! You can do a little more with a lot!