[Elecraft] Kany: Dumb Question - Crystals

[KBG Luxford]

I am wondering what must be the good reason why kit suppliers provide 
crystals with two wires when crystals with three wires are available - 
the middle wire being connected to the external metal case, thus making 
earthing of the case a very quick, simple and safe operation.

Every time I have to solder grounding wires to the case of a crystal, I 
get the nervous jim-jams, as I am afraid that I will damage the crystal 
by overheating, although I try to be ever so quick - a bit like my 
countryman, the late Errol Flynn.

I guess the answer must be cost.

73
Kevin
VK3DAP / ZL2DAP