Opened this element (beyond dead) to convert it to Ceramic with an MC-564 ceramic bar, but found this skinny “yoke” as I call them that attaches to the crystal packet. Seems this one may have had (or not) thr skinnier packet out of say an MC-151 or similar. I myself have never seen this. Original packet was grenaded, but seems to support my theory with what little is left. This element has the earlier thicker diaphragm. It was very much untouched as far as my eyes told me. What little wrinkling that can be seen is from me breaking the fossilized glue holding the diaphragm onto the puck.