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1

That's a common failure mode for those lamps; the threads are fairly shallow and prone to stripping out. Though if it happens immediately, rather than after a few years of use, I would definitely return it for refund and/or replacement. If it fails after the warranty has expired: It is possible to kluge the connection by wrapping the threat in teflon ...


2

Nope. The manual makes no mention of having to remove transfer bolts, if the techs want to make a stink about there being bolts and you didn't remove them: no way! Not even if they do exist. It's probably a penny. I'm unsure, but if the problem is user created this service call might cost you money even if it's under warranty. They might claim you, "put ...


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There are conventions. Bolts are referred by the size of the hole the bolt (not head) will fit. A metric 10mm bolt's threads are commonly 1.5mm, 1.25mm or 1.0mm between threads. By contrast, an English 3/8" bolt is standardized at either 16 or 24 threads per inch. Note the different way to measure threads. I suspect your bolt is one of these. I'd go ...


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It's not the diameter of the nut but the diameter of the bolt thread at its largest diameter. The inside diameter of the nut only equals the narrow part of the bolt thread. This page explains it perfectly for you; https://www.boltdepot.com/fastener-information/Measuring/Measure-Diameter.aspx


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15mm is the size of the opening in the wrench that fits across the outside flat surfaces of the nut. However nuts and bolts are designated by the diameter of the hole in the nut, not the size across the outside flat faces. The hole might be only 5mm or 6mm in dia. (or maybe not metric at all). The other necessary measure is the pitch which identifies the ...


2

Nuts and bolts start with two options, US or metric. US units tend to be in inches, metric units are typically millimeters. The size of the socket is completely separate from the size of the bolt and nut. The size of the nut/bolt is measured outside of the threads on the bolt, not the nut. So a 15mm bolt measured from the diameter from outside the threads, ...



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