Specifically, this heatsink: Fischer Elektronik LA6/150 12VFischer Elektronik LA6/150 12V. I'm trying to work out how that might be used so I'm putting it out there to see if anyone has used something like it or have ideas. From what I can tell, it 'seems' to be used with a removable bottom plate for 'flat' semiconductors but I'm thinking that something like, say, a TO220 package could be attached to the side with a self-tapper. A bit like they show with their LAM series heatsinks (PDF, sorry for the non-Farnell link!): here they show them with transistors 'clipped' to the side on the K version so I'd assume that on the non-K version, one would just screw it on. What think you lot?