I got these years ago as replacement knobs for the many early 400RB's that I was picking up missing knobs … I have used a few, but they sat in the drawer now for several years … with no more GK RB heads in the house, or in my future, might as well pass them along to anyone that can use them … they should work on the GK's after about '90-91 range, the small knob era .. the blue capped ones are the same as the gray, just add a little variety ... pretty much just passing these along to another TB'er, covering shipping ($3.50) and have enough to buy a cheeseburger without cheese at McD's off their $1 menu … unless you send PP as a purchase, then I would come up short 
$4.50 shipped lower 48 … if you can use them give me a shout …
$4.50 shipped lower 48 … if you can use them give me a shout …
