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Message: <blockquote data-quote="John Russell" data-source="post: 1715562" data-attributes="member: 22179">As long as the head doesn't get contaminated with sand or suchlike, I don't think it's going to wear out in a decade or two. My Gitzo 1277 needs the friction dialled up a bit more than when I bought it but the function is not in the least impaired. Its probably just a deformation of the nylon or teflon components.The post might snap if you hit it with a sledgehammer but I think the real threat is the scope foot and its thread in particular. This is one of my pet gripes. Scope manufacturers supply these ridiculous 3/8" to 1/4" adapters with two thread turns and even the 3/8" thread depth on the foot is IMO inadequate (ca. 8mm on the Zeiss Diascope).I recently replaced a Manfrotto QR system on my ballhead with a Novoflex Q Mount (Arca Swiss type). It's superbly made but the 3/8" screw on the QR plate only has a thread depth of 5mm, a disaster.John</blockquote>