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My Gizmow mower has deck spindle covers held in place by four knobs with 3/8 threads. They tend to vibrate loose, and today when I looked, I only had one left in place.
I remember once before I ordered some spares from a general farm supply catalog, but can't remember where.
This image shows the top and bottom views. Any ideas?


Thanks,
Charles

Some of your larger hardware stores carry these, also known as furniture knobs. Good luck

Woodworkers supply houses also have them. Make sure you use some lockwashers when you put it back together.

Napa will have the right ones that will not come loose

Ya they make nyloc ones they are expensive and sometime require channel locks to put on and take off but they don't move