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Hmm. The issue is the base of the transistors. They tightened the screws down with the tabs soldered in and without enlarging the holes. What this did is bend the screw tabs down and bend the metal part of the transistor into a slight U shape. I think it might be best to sand the surface of this down flat on a block as counter sinking would still leave a risk of this U shape not contacting the heat sink properly. The shape it made isn't very uniform. This way I can also check with a straight edge and some feeler gauges to get them as flat as possible.

[QUOTE="Tolteca, post: 633677, member: 52008"] Hmm. The issue is the base of the transistors. They tightened the screws down with the tabs soldered in and without enlarging the holes. What this did is bend the screw tabs down and bend the metal part of the transistor into a slight U shape. I think it might be best to sand the surface of this down flat on a block as counter sinking would still leave a risk of this U shape not contacting the heat sink properly. The shape it made isn't very uniform. This way I can also check with a straight edge and some feeler gauges to get them as flat as possible. [/QUOTE]

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