[Elecraft] KNB2 Installed, but...

[L Kendall]

I built the KNB2 board and installed it today.

No problems with that, but it occurred to me while the 100 Watt board
was removed to check the TO220 packaged Q7 and Q8 on the RF board for
any electrical continuity to the heat sink .

I have to back those 4-40 nuts out to barely finger tight or it measures
short to ground. 

Is there a suitable substitute material I can use for those adhesive
insulating pads between the transistor and the grounded heat sink?
Elecraft p/n in the manual is E700002. 

Thanks,
Larry
K5END