I have used both, and currently use SolidWorks.<br>
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As with any of the smaller packages it will not do what the big "Work-Station" programs can do with modeling free form shapes. But with that said, I prefer soildWorks to Pro/E, as it is far more easy to use, and learn.<br>
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This might be a lame suggestion, but...<br>
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You might check the stretch in the bolts, over time.<br>
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You also might check the spacing between the flanges.<br>
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If the "Helicoflex" is relaxing, maybe creep, or hysteresis is unloading the bolts.<br>
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