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Re: [cw_bugs] McElroy P-500

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  • D.J.J. Ring, Jr.
    With the introduction of the P-500 keys, McElroy s keys started to be very similar to Vibroplex s keys. The shorter left hand screw adjusted a cone shaped
    Message 1 of 5 , Mar 13, 2010
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      With the introduction of the P-500 keys, McElroy's keys started to be very similar to Vibroplex's keys.  The shorter left hand screw adjusted a cone shaped compression spring.  David Ballentine, KK4DW, has a good picture of such a bug showing the spring:  http://www.goofus.org/MACP500.jpg

      With the old style Mac Bugs - and also the S600 Stream Key (which I believe is one of the most beautiful keys ever made) the pendulum return spring is configured differently - probably to avoid patent infringement with Vibroplex.


      On the S600:  On the left-hand side of the instrument, the screw you call a "centering screw"  has a knurled adjusting screw threaded on it which holds in place and adjusts by it's position on the screw,  a long coiled compression spring through which this machine screw passes and which at the end nearest the lever, fits into a hole of the same diameter which was bored into the lever to fix the spring. 

      73

      David Ring
      N1EA

      -30-




      On Sat, Mar 13, 2010 at 10:05 AM, TJRachwal <tjrachwal@...> wrote:
      Hi Guys,
         I just recently required a McElroy P-500 bug.  I have a question
      about the mechanics of the bug.  It seems it doesn't center after
      sending dits, I believe there is a spring missing..  I have checked all
      the sights for a clear close-up picture and can not tell if there is a
      spring missing or not.  There are two longer centering screws and then
      there is a shorter screw that appears to do "nothing."  I believe there
      should be some sort of spring (maybe a cone spring) that would center
      the arm after making a dit.  If anyone has a P-500 or knows the answer
      to my question I sure would appreciate knowing.  A picture of their P
      500 would help if it shows what that short post does.  Of course if I am
      correct then I need to track down a spring that would work as I am sure
      a correct part won't be available.
         Any advice or help sure would be appreciated.
      Tnx es 73,

      Ted K8AQM


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    • john@morsemad.com
      Take a look at my picture number #069 on my web page. You can hopefully see the spring in place: http://www.morsemad.com/mc.htm   John / G0RDO
      Message 2 of 5 , Mar 14, 2010
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        Take a look at my picture number #069 on my web page.

        You can hopefully see the spring in place:

        http://www.morsemad.com/mc.htm

         

        John / G0RDO

        http://www.morsemad.com
      • cameldriver777@aol.com
        Hello Ted, I have a spare exact original dit spring that you are looking for. Is your QRZ.COM mailing address correct ?? BTW out of all the Macs I have
        Message 3 of 5 , Mar 14, 2010
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          Hello Ted,  I have a spare exact original dit spring that you are looking for. Is your QRZ.COM mailing address correct ?? BTW out of all the Macs I have owned, including the S600 and the 38B, the P500 has the best feel of them all IMHO...hi......  73  Pete W5PEH
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