Carefully open up and gut a good PT valve to repair a blown FC valve that is rebuildable, unlike the sealed for life PT variety? There is always a way, but worth the trouble is the question.
So long as the main components [body and poppet valve] are OK, rebuild kits are available, and can be had quite cheaply.
https://www.outdoorking-forum.com.au/engines...ls/victa-decompressor-repair-kit-en72684 - this suits all rebuildable Victa deco valves, which have three clips holding the diaphragm chamber together.
Most times one of these is also required;
https://www.outdoorking-forum.com.au/index.p...;cPath=193_514_302&products_id=33881The PT EN72541A deco valve uses a smaller diaphragm than the EN72135 full-crank one, so it isn't a usable parts source.