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from Brown Corpus
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Fig. 8 gives the dimensions for locating the dog-pin holes.
Center-punch and drill the No. 31 hole 7/16'' '' from one end of the bar.
Chuck a length of 1/8'' '' dia. drill rod into a drill press or some similar turning device and while it is rotating file the end square and then file a slight taper 1/8'' '' long.
Cut the piece about 9/32'' '' or 5/16'' '' long and drive it into the No. 31 hole drilled in the locking bar.
File the bottom edge flush with the bar and the top 1/8'' '' above the bar.
This dog will engage a notch to be cut in tappet 3.

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