[Harp-L] Crystal Microphone Element



has any here tried a replacement Crystal Microphone Element or any newer Crystal Element with any luck?
I am always looking on eBay but there either untested (another word for it don't work) or there price is beyond absurd.
here's one listing I was going to try for 15 buck it wouldn't be a huge loss.
 
http://www.ebay.com/itm/Astatic-Crystal-Microphone-Element-D-104-Qty-1-/320771285619?pt=LH_DefaultDomain_0&hash=item4aaf756273
 
Specifications
Size  L  50 mm   W 50 mm  D 16.5 mm
Impedance 9 k ohms
Sensitivity -55 dB


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