This is meant to be something of a treatise, inviting all respondents and opinions on "tweaking", or making small customized adjustments on so called "factory perfect" adjustments on the Hasselblad equipment, to achieve perfection within a particular owner's personal equipment array. Speaking of several pieces I have at hand are a 553ELX and the 80mm T* lens I will be using on it. I've made some on-film focus tests, viewfinder focus tests, and engraved lens scale tests, as well as dial caliper checks. Nothing is adding up perfectly. The body is very close to correct on the mike measurements, film, and finder checks, but it could be a bit better. First let me say that the C's, CM's, ELM's are worthless due to thier mirror pad problems, so I'll concentrate on the aforementioned pieces. I have my T* lens at hand, but I also have 2 of the older chrome barrel 80's that have NEVER been tampered with. You can tell by looking for scratches on the screw that holds the scale on. This is an easy screw to chew up with even the best of tools. The 2 chrome lenses are 1/16' off to the left on one, and 1/16' off to the right on the other. So much for factory perfect. To achieve this 3 foot test, I've had to put 3 little pieces of masking tape under the mirror hold-down pawls (for now). Without this tape, the lenses focus more like 2'10 or 11 inches on the scale. So I have a choice of "tweaking" the 4 focus screen pegs, or the 2 mirror pawls to get the perfect 3' on scale, and on screen. I'll leave this discussion here as I'm off to go to town 10 miles up the road where I can set up to test on the town water tower (infinity testing). But I'll lay the question out there: what is your opinion of small non-laboratory adjustment "tweaking"?