Very simple fastening system on the center pole of the tripod. Since I'm not raising the B-pillar, I installed it under the crossbar in an attempt to create a more stable platform. It fit but got in the way when they folded their legs in preparation for transport. The mount was accurate when pressed firmly against the post, but it didn't seem like the "strap" would do the job of keeping it too tight for too long - which means that with a comfortable fit, the Bubble would be slightly affected depending on pressure on top or bottom of plastic case. A twisted wire or a thin collar will solve this problem, but the bulkiness will remain. Not a good solution so far as I've also tried a large round disc, but it really got in the way. Nothing beats the built-in spirit level setting to prime your tripod for stitching multiple panoramic shots together.
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