Ron's got it with the 'tighten to fit for the first one' and then go from there...and I also have the built in shirt holder here...LOL I do my hooping on one of the 'arms' of my 4 color screen printer...just the right height, and I can put the shirts or sweats right on it just like I"m going to screen them-lay a straight edge across if I need to make a chalk line for straight line up...then slide the hoop and backing underneath (now you know why I hit the bottom hoop with a little spray to hold the backing. Put the top hoop on, line up the chalk marks and move the bottom one if necessary, and pop the hoop on. I always 'doublecheck' the tension screw just in case..some shirts are not consistent in thickness, or you may have loosened the screw on removal... I have huge hands....so I can pull the material away from the hoop in 3 directions at once (with the gray hoops-not the wood ones) and keep it tight. If I get a pucker, I hold the top hoop down with the flat of my hand-and gently pull the material under the hoop away from the pucker. Pull too hard-pop the hoop....and then I double check tension again. Usually a pucker means the hoop is just a tad loose. it's tote bags and thick jackets, or nylon/poly jackets-I just can't get them to stay put without using side clamps... Roland