How to set the hairpin match on the 
2 Meter Tape-Measure-Beam 
Ben said to take a bare piece of wire and twist tie it around the pipe / hairpin match. You want it snug but loose enough that you can still slide it up / down the other bare wire which forms your hairpin match. Solder it in place once you have tuned it to the lowest swr. Remember to check the swr when the antenna is not near anything after each small adjustment.
Be sure to leave enough wire to slide up / down on to do your tuning. Again tack the sliding wire in place once you have found the lowest swr.
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Marshall County Alabama Repeater Systems