Hi OWP, not sure which 1st Chair spindle model you purchased (there are 9 sub-models across 4 base frames), but believe all of them have 3 main adjustment points similar to the top-end model:
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1. Ensure the “seat lock” wing bolt directly under the seat is tightened.
2. Ensure the “height lock” collar (B in the Figures) is screwed all the way down to the nylon bushing at the top of the tripod base.
3. Ensure the “spindle lock” wing bolt (A in the Figures) below that is tightened.