The high pitch stop is a bushing on the pitch change rod and its easy to get to without removing the prop. Normally they're set up to prevent the pitch change fork from bumping into the hub casting at coarse pitch, but there are also airframe considerations as is the case here. Its pretty easy to get to by removing the dome, but it requires a new dome oring and resealing the threads. The stop itself is just an aluminum bushing that one could easily duplicate on a lathe but longer to prevent the prop from interfering with the cowling.
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Bob Japundza CFII A&PIA
N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.