[GreenKeys] Part help

[Jim Haynes]

On Mon, 11 Jun 2012, Charles Ring wrote:

> Teletype was notorious for using nonstandard hardware and I wonder if
> that applies to bearings as well. Also I have forgotten the explanation
> of why they used nonstandard hardware, maybe to prevent replacement with
> hardware made of inferior material?
>
You are probably talking about their use of the fine-thread series of
bolts and nuts, 6-40 and 8-36 for example.  These are standard but
uncommonly used.  When used in adjustable places they give a finer
range of adjustment.  When used in thin metal they hold better, are
less likely to strip the threads.