Really high end planetarium projectors used to have water cooled blocks for the scanner mounts.
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I have a few scanner mounts with forced air cooling.
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As long as you do not chill them so cold that you are not: 1. Below the dew point, causing condensation in the bearings or sensor, 2. Stiffening the bearing oil, 3. Causing excess drift in the position sensors. 4. Shrinking the moving coil to magnet distance too much, You should be fine.
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The data sheet for the US or European made scanners will have a lower limit temperature and a spec for sensor drift vs. temperature.
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50F should not have been a problem.
Steve
Qui habet Christos, habet Vitam!
I should have rented the space under my name for advertising.
When I still could have...