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Both the contact spacing and the tension of the dot and dash levers are independently adjustable.  This is done by loosening the small  5/64 allen head screw on the associated post and sliding the brass shaft in the post to the desired setting.  The allen screw only needs to be snug to hold firmly.   Extremely close contact spacings can be tedious to obtain but with a little practice and patience the adjustment can be easily made.  One trick is to sandwich a thin piece of paper between the contacts while tightening the set screw.  Then carefully slip the piece of paper out leaving paper thin contact spacing.  For arm tension, the tighter the spring is compressed the more paddle pressure required by the operator.  Adjustment is easy once you get the hang of it.   Be sure to grip the rod at the knurl and hold very tight while snugging the allen screw.  This minimizes movement of the pin as the screw tightens.
 
Each paddle is supplied with a 5/64" allen wrench.  If you find it hard to use, consider purchasing a small 5/64" handle wrench at any Sears Tool Store ( Craftsman part no. 41692).  They cost about $4 and work great for this application. 
 
Adjustment Advantage ... Once secured, the spacing and tension settings stay put.  They do not move over time like other screw/nut tightening systems commonly used in CW paddles.  I have not had to touch the setting on my paddle for over 2 years.
 
 
Set screw in each post.  Loosen to slide rod.  Use 5/64" hex tool (supplied).
Slide rod to adjust spring tension
Slide rod to adjust contact spacing
Single Lever Paddle Adjustments
Iambic Paddle Adjustment
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