The Gary Honis website is a great guide for Canon astro mods. I have modified, and cooled, several 450Ds over the years. Rcheshire here on IIS has good info on cooling if your interested in going that way at some point.
With Gary's mod instructions, an important aid is to write down every thing you do when you take the camera apart. You don't want to reassemble and find left over screws etc. I used to use a run sheet and tick off each step for disassembly and then reverse for reassembly.. Have fun.
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