i ordered a 12.5" extension after reading some good reviews about this product, but mine has some very severe problems. basically the opening is way too small to fit any of my pool cues. you have to really push to get it to fit, and even then it doesn't go all the way down. so the extension is barely hanging on and crooked as well since it doesn't have much to hold on to. in addition the fit is so tight, the air pressure inside the extension is counteracting you as you try and push it on. i drilled a hole to vent the pressure to solve that problem. the tightness of the fit also caused the foam lining inside to rip apart as you insert and remove the cue. i've super glued back the pieces that ripped off, but it's just gonna keep happening i suspect. also the top ring came unglued, i had to super glue that back on as well. i'm very unhappy with it, i can't see how this thing can pass as a usable item. maybe i will try a longoni....