To help you find information quickly, regardless of the business hours.
You find catalogues, short guides, datasheets etc. here for download:

Hardware, excerpts Keystone Electronis catalogue (M70): Control knobs, EHC catalogue beyond control knobs:
Spacers, Standoffs
Pin, Plugs, Jack, Sockets
Panel Hardware
Multi-Purepose Hardware.pdf
Product Catalogue Instrument and Push-on-Knobs Teil 1
Product Catalogue Instrument and Push-on-Knobs Teil 2
Product Catalogue Instrument and Push-on-Knobs Teil 3
Fuse Holder
 
Keystone fuse holder