Hi Tom - yes, that was a surprise....(I have a very good dial indicator that I trust).  I have not disassembled this crystal but I note that the pins have hex "nuts" at their base implying they are threaded into the bakelite case from the outside.  So there may be room for some "slop"; bakelite machining being somewhat non-precise.  I don't know what the pin spacing tolerance spec may be. 
I only have this 1 crystal so my sampling statistics are pretty poor!  But I am sure a "3/4" socket will be the way to go.  BTW this crystal fits nicely in the "big" crystal sockets on the GRC-109/RS-1 transmitters too. (Why?)  haha
Tim
N6CC

On Thu, Nov 18, 2021 at 10:41 AM Tom Lee <tomlee@ee.stanford.edu> wrote:
Hmm...nine mils greater than 3/4"?

Sent from an iThing, so please forgive the terseness and typos.

On Nov 18, 2021, at 10:27 AM, Tim <timsamm@gmail.com> wrote:

Hi Steve - correction on the "pre-coffee" ! spacing measurement:  This DC-11-E crystal example is just slightly over 3/4" spacing.   (0.759")
Pins are 0.125 diameter...
Tim
N6CC

On Thu, Nov 18, 2021 at 7:50 AM Steve WD8DAS via ARC5 <arc5@mailman.qth.net> wrote:

Thank you Tim!  7/8" spacing is one of the dimensions I've seen reported. 

Last night I finally found one DC-11A crystal in my stash and the pins were the same 1/8" as yours but the spacing was closer to 3/4" (but did not seem to be exactly 3/4, so maybe it is 13/16? 


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