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[TCML] Soldering SISG heat sinks

Hi Guys,

Really feel pretty stupid asking this but not sure where else I can
go....;- (  

Have built 4 of Mark Dunns awesome SISG boards and am having an awful
time trying to solder the heat sinks to the board....  Is there a trick
to this besides getting some huge wattage soldering iron?  Pads and heat
sink posts are clean and am using a flux pen for the flux....  Would I
put the components at risk if I don't solder these down?  

Any thoughts would be most welcome..... 

Best Regards,
Bob Johnson
The folly of mistaking a paradox for a discovery, a metaphor for a
proof, a torrent of verbiage for a spring of capital truths, and oneself
for an oracle, is inborn in all of us. -Paul Valery, poet and
philosopher (1871-1945)

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