Hopefully the picture will help, but basically my PB (who insisted) that he winterize the pool for the 1st year close or he warranty would not be honored (yeah whatever) cracked off a "recessed" winterizing plug in one of my spa jets. He tried for about 2 hours to extract it, and failed...finally just putting a regular old plug in the hole and said he will most likely have to drain the pool (below the jet) and worry about it in the spring.
Attached is a picture...my crude drawings in red are the "recessed" plug that he is using...lord knows why he needed this special plug, but Hayward told him he did. It basically is a winter plug that is "attached" to a long (6") piece of PVC and it screws into the back threads vs. the front ones. All that is left are the threads and about 1" of the plug....it is about 2" into the walls of the jet.
Any creative ideas how to extract this...and once again hopefully others have seen this kind of plug and can help out.
[attachment=0:1d5g92sf]spa cracked plug.jpg[/attachment:1d5g92sf]