Because the top of your pipe can mushroom during extreme impact (rocky or hard ground), the gas pounder can get locked on to the top of the pipe. Please check the top of your pipe frequently to avoid this problem. This problem mainly occurs on our small pipe anchors for vinyl fence.
Tips to avoid in the future:
1. Check top of pipe every 6 to 8in initially when driving to assess how much
the top of your pipe is mushrooming.
2. Use a 5lb sledge hammer to re-form the top of the pipe back into some of
its original shape (the top edge should be soft enough to do this).
3. Trim the top off with reciprocating saw or hack saw.