I just remembered an old spreadsheet that I was using when wringing out my gear some years back. It generates a graph showing the ƒ stop deviation and the erratic variation of the shutter, too. The procedure is to run through the shutter speeds at one firing per speed from slowest to the fastest, then from the fastest to the slowest and another run from slowest to fastest. The idea of this is to see the effect of shutter spring/mechanical condition coming from both directions. If you enter your results in the spreadsheet, it will represent the ƒ stop deviation on the right hand Y axis (the solid line) and also show the erratic nature of your shutter on the right axis in %.
The site won't allow uploads of spreadsheets or zip files (I couldn't see a method, anyway) so I'm attaching a shot of the graph element. Let me know if you want a copy of the spreadsheet and I'll bounce one to you. It isn't really a "ready-for-prime time" item but I used it for quick snapshot views of my shutters. It might make for a good starting point for someone to tune up some more.
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