I've never really cared for the PH system, always seems a little less than substantial. Really early conversions had a little block dovetailed to the bottom of the receiver, later ones used a small stud silver brazed in place. The GPC price is a good one of rmagazines; have seen original PHs listed for $75.
If anyone wants to try a conversion, I MAY have most of the parts in my junk bins. Probably on the rough side, may be steel or aluminum, will definitely need refinishing. No magazines. You can have them for the postage, PM if interested, and I will see what I've got.
OK, I received a PM expressing interest.
If I can turn up more than one set, I'll mention it.