Robert Darrah wrote:

 You can take a regular bit and grind a left hand cutting end and turn

it

 backward and do the same thing (most of the time).  You have to clear
 the chips often if it doesn't catch and unscrew itself.

 Bob Darrah

Ken Welter wrote:

  I don't think so, the left hand bit can be found at Napa and Snap-on.

Has worked for me, many times.

Bob Darrah

 
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