all the Gamma machines that use the RED color scheme will be built like a tank compared to the new machines that use the BLUE color scheme.
The new Blue machines are bolted together sections of extruded metal whereas the RED machines have components that are heavy castings which will be much stiffer and stronger and tolerate a higher level of daily use/wear and tear.
On the Red machines the base TRAY is plastic and acts to cover up the base casting and even though the tension head and clamps have polymer components I have never had a bit of trouble with any of them.
I would go with the older Red machines over the newer Blue machines.
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