[Elecraft] Silvery Thermal Pads

[Roy Morris]

When I removed the KPA100 PC board to do the KPA100 Upgrade the thermal pads of Q1 and Q2 stuck to the transistors.  I noticed that the bottom of these pads were silvery where they joined the heat sink.  Some of the black part of the pads remained with the heat sink.  I will replace these thermal pads.  Should I attempt to clean off the heat sink surface where these pads left their residue?  And yes, I will be very attentive in tightening these screws after a small amount of use in the future.  These pads I am removing are not the original pads, so I don't think I have overly abused the finals.   Thanks for any comments.
Roy Morris  W4WFB