I am a 50 year old female with no experience in these skills and have researched/reviewed ALL the complaints. Installation of B4: no problems and took 25 minutes. Here is my research and solution to the most common complaints (using spacers also solves all tilt/sag issues) of 19" to 22" TVs, the screw size is M4; However, I have 32 inch and the size is also M4 (30-40 inch could be size M6). EXAMPLE: Included: M4 x 30mm screws *TOO LONG* Gaskets are used when the screws are too long or there is a gap between the bracket and the TV. Most screws should have a gasket to allow airflow behind the TV etc. The TV is always 1.25mm. Most washers are designed to distribute the load evenly across the bolted joint with the material they are used with. For example, driving a screw into wood can cause the wood to crack across the entire surface. Washers reduce the risk of such damage by distributing the fastener load evenly over the surface of the material. Not all materials require the use of wood and other relatively soft material washers. Washers made from a relatively soft material are useful for protecting against stress-related damage when driving a threaded fastener driven into the material. Contact with the object to be connected than with the side of the bolt. The number "1 mm" means 1 thread per millimeter. EXAMPLE: M6 refers to a 6mm metric screw. External thread diameter 6 mm. The standard metric screw is actually M6 x 0.1mm. The number 0.1 mm means 0.1 threads per millimeter. You can identify an M6 screw by a little over 7/32" (0.228") in diameter.
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