[GreenKeys] ST-6 routine maintenance

[Roy Morgan]

As I remember it, what you refer to is a "self-locking" nut. It has a usually-nylon washer shaped insert on one end, the inside diameter of which ensures that the nut stays in place once installed. 

I remember some that had a fiber-phenolic locking part. Further, some such nuts are made entirely of metal, the locking part is likely threaded also but has segments that are bent inwards and create considerable friction against the screw or bolt. 

An "acorn" nut is closed on one end and likely creates no locking action. They create a finished appearance and may usually have been chromed. The BC-779 used them to fasten the cover to the panel. 

Roy Morgan
K1LKY Western Mass

> On May 30, 2020, at 11:43 AM, Ralph Irish <w8roi at wowway.com> wrote:
> 
> 
> And, if there is an occasion to remove any boards with toroids, consider replacing the hex nuts and lock
> washers with acorn nuts, or whatever those nuts are called with the plastic or fiber "snubber" ...
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