Author: Gordon (NZ)
Date: 2003-03-26 22:53
If the screw is of the pointed type with a head, then ideally the end of the key should be appropriately counter-bored (special tool) to accept it without jamming.
However some screws like this are not actually designed to go right in - cost-cutting manufacture, but easier adjustment should this be necessary.
If the screw has a head and a cylindrical pivot end, then either this end is too long, or it is slightly bent. Often a tap on this end of the key with a soft hammer will stop the jamming.
The band-aid fix for both of the above is to use Loctite, available from hardware or engineering supplies. Unscrew the screw a little first, apply to thread, and then correctly position the screw. It wicks through the threads and within minutes, sets to a plastic.
YOU MUST NOT USE JUST ANY LOCTITE!! There are many varieties. Most are designed to set very hard, and a pivot screw would break before it came out again. The type you want is called "222". It holds small screws securely but still allows adjustment. "242" is firmer, and you could also get away with that.
If the screw is of the type with no head, then Loctite is definitely the answer.
Next best is nail polish on the slotted end of the screw. Nail polish snaps apart when adjustment is attempted, and typically secures only the end of the screw, often allowing the pivot part of the screw to wobble if the threads are 'sloppy', which is very likely if it works its way out.
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