as our sport is young with no exacting standard universally, different bars and forks with different tolerances when put together wrong will make one end of the scs more effective than another and for the bars to come out that's usually the bars being too small or fork being too large which makes the clamp tighten unevenly thus not the full pressure on the bars to hold it in place, when the fork tube is too small/bars too big, it feels like the headset is loose. easy guide to know if everything is correct is if your parts fit together with minimal stretching of the clamp but when the clamp is loose, the clamp should still fit snugly and with pressure, should slide onto the fork tube/bars slide in. i suggest putting in a grub screw thru the clamp that locks the bars into place in case of the worst happening.
