I used these on a project that required over 450 of these black theatrical mask grommets. I've had fewer than half a dozen failures, mostly because I forgot to put the smaller ring on the protruding hub! After drilling through the fabric with the hole punches provided for the drill, hemming and reinforcing with Fibra tape, I laid my work on a flat steel plate and used the ball end of a ball-peen hammer to flare and then smooth the bushing. the flat end of the hammer. This worked flawlessly and was much faster than trying to position with the adjustment tools. Everyone said they worked well!