I don't use them often simply due to them being most useful when doing batches of parts. And as shown in the video there are some problems with them. However sometimes they can be quite useful so here are a couple tips on the cross stops that I have found ............
Don't use the narrow setting on either piece. Go medium or wide for both. In most situations the linear alignment of pieces can be easily adjusted with a few mallet taps. And this would be needed even if going narrow on one piece and wider on the other anyway. Using wider settings on both pieces gives the maximum room to align pieces.
I have found that stack up error is reduced by placing the pin firmly against the end of the previous mortise but NOT pulling it tight to the end. I first figured pulling tight would ensure minimal variance by making sure the reference was always the same. But in practice I found that pulling tight tended to "stretch" the spacing by a tiny amount therefor stacking more error not less.
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The other thing I find is that frequently the stops are much longer than needed and get in the way. So I bought a second pair and cut them short.
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Seth