I use a pair of channel lock pliers adjusted to just smaller than the diameter of the plug stem. Holding the plug in my left hand (to protect the frag, my thumb and fingertips go around the base "cradling" the frag in the palm of my hand), I work my way up the stem crunching a bit at a time. Do this over a shoebox size container to catch the pieces of the plug that break off.
ORA's plastic frag plugs either need to have the frag "popped" out (using the channel locks around the base of the plug, squeeze gently to loosen the frag from the base) or cut off the stem with a saw (a bit more of a pain).
Hope this helps.
Cheers,
Ray :cool: