I just thought I should let you all know that the driveway marker may not be all we had hope it to be.  I made a 5 iron recently with Dan Neubecker's improvements.  While it helped my swing tremendously, today the shaft failed on me while hitting balls at the range.  It didn't break in two, but it just seemed to splinter apart just below the grip for about 3-4 inches.  Too bad, it really worked wonders for my swing.
 
BTW, It failed on a particularly bad swing, during an overly-abrupt transition at the top.
 
Don Barry

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