When adjusting for verticle height, is the hole in the base threaded (everything above above it has to be loosened) or does the column just slide up and down (with a keyway) from turning the lower wheel? Thanks.
Had to read your question a couple of times, but think I got it now. The post is threaded with a slot for the locking key. The hole is the base is smooth. You adjust the height with the wheel.
