I designed a set of protector caps for the TSO Parallel Guides to protect them, I often find myself setting down my track with the parallel guides still attached on my bare concrete garage floor very gingerly so as to not dent or scratch them. They're also designed with a cutout to allow them to sit flat in case you have the end of them resting on another board to prevent tipping.
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The model files are here for here (there's also a link to my etsy shop if you don't have a 3D printer and are so inclined):https://www.printables.com/model/440140-tso-parallel-guide-protection-caps
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The model files are here for here (there's also a link to my etsy shop if you don't have a 3D printer and are so inclined):https://www.printables.com/model/440140-tso-parallel-guide-protection-caps