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Sent the cylinder to Cox Airparts in Wichita. They did the overhaul pins and everything and bench tested before sending back. I asked before sending my cylinder to them if they wanted the hook/pin mechanism to come with the cylinder and they said yes, to test it. Once it got there they advised about the pin issue. Although I sent it for a leak/overhaul, while they had it they updated the hook pin mechanism. Very happy with them.
I was suspicious about my plastic spring guide, that plastic was in such a critical area, and questioned it's age/integrity. Discovered the spring guide issue while combing old Cessna Pilots Association articles where John Frank wrote about it on cessna 210's. I then found service letter for 337's advising the updated steel spring guide.
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