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Much like the Weldon shank side-lock configuration, the PRECI-FLEX Whistle Notch Adapter is another side-lock chuck that uses a set
screw to clamp the drill or endmill. However, unlike the Weldon, the Whistle Notch Adapter has the set screw
clamping against the drill or endmill at a 5 degree angle. This 5 degree angle will push the drill or endmill
back against a stop in theory. It is up to the end-user to properly set the depth of the stop otherwise the
clamping system becomes ineffective. Each adapter is equipped with a set screw at the bottom of the chuck to
act as an adjustable stop.
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