<silicone grease and still functioning with out a
<hitch after 25 years. Their contact resistance still
<measures less then the original dry contact resistance.
<I put silicone grease on the contacts of the USART
<socket, in my Poly88, back in 1979, to fix a flaky contact.
Perfectly reasonable thing to do to protect the metals from
contact with air and resulting corrosion.
Allison