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Bob's Rifles, or Sporterizing some Turks - 2
This is the jig in place, with the stop (small vertical roll pin, almost dead center in the picture) against the receiver. Notice the shiny area on the spacer next to the pin. This area was ground away to clear the left receiver feed rail. When using this jig, or a Wheeler jig, always check that the upper piece that holds the drill bushings is square with the receiver base. (To see how to check this,GO HERE, except that you will be checking the top bar of the jig, rather than the scope base.) If the top piece is not square, STOP, and find out why. In this case the forward spacer was jammed against the receiver.
THE BUSHINGS ARE SHOWN NEXT TO THE WRONG DRILL/TAP !!! THE #31 BUSHING AND DRILL GO TOGETHER, AND THE #27 BUSHING GOES WITH THE TAP !!! THANKS TO "MIKE" FOR POINTING THIS OUT. THE TEXT BELOW HAS BEEN CORRECTED.
These are the bushings that are used to guide the drill and tap. The B-Square base (and most others) use a #6x48 screw, requiring a #31 tap drill. The #6x48 tap is snug in a #27 bushing. These bushings are HARD and can dull the cutting edges of a drill quickly, so with the drill press OFF, lower the drill through the bushing until it touches the receiver, and then start the drill turning. Before starting the press, ONE drop of cutting fluid goes onto the drill so that the fluid runs down the drill and into the bushing, and onto the receiver.
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