HF welding table height adj mod - eliminating mod b/w inner and outer square tubing

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This video shows a mod to make the HF welding table height adjustable: The height of the table out of the box is very low - you either sit or bend over a lot, hence the mod.I performed this mod and it's great in that I can get the table top up to ~47". Only issue is the inner square tubing I'm using (and probably any square tubing that would fit with enough room to slide inside the factory square tubing) has too much slop to the outer square tubing.Pic of one of the two lower legs:

Pic of one of the two upper legs:

With 2 legs, each of which has a lower and upper joint of inner and outer tubing, there is a lot of wobble in the table. For the upper joint, which is fixed (once the pieces are fastened, there is no need to separate them in normal use), I was thinking I could just wrap the upper end of the inner tubing w/ duct tape to eliminate the play. For the lower joint, this wouldn't work, as the inner tube has to slide inside the outer tube to effect the height adjustment. I was thinking I could cut up some shims out of sheet metal and insert them whenever I set up table to a desired height. I suppose I could also weld those shims to the outer tubing, but as a very green newbie welder, there's a decent probability that I'd burn holes in the factory outer tubing.Any other ideas on eliminating the play between inner and outer tubing?Last edited by goggins; 4 Hours Ago at 09:04 PM.