My Laser Scepter - Build Picture 4
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This picture shows the external heatsink after sweat soldering. The ID is where the water flows, the C'Bore is an O-Ring surface to seal the heatsink to the internal heatsink. The stainless steel parts are used to clamp the flange, compressing the O-Ring, forming the seal between the inner and outer heatsinks. The T shaped piece at the top is the inlet to fill the heatsink with water once it is all assembled.