Evinrude mixture screw knobs?

Bunky

New member
I picked up an older Evinrude 4hp, I had to take the carburetor apart to clean it as I was assembling it, I noticed the knobs turn on the mixture screw's is there a way of fixing this with out looking for replacement knobs the knobs just snap onto the splined shafts.
 

Bunky

New member
Drilling and tapping would be a good idea. But these knobs are plastic so I'm not sure it will work
 

Andrew Mackey

Moderator
I would drill from the front into the shaft, then tap the shaft itself for a small screw. The knobs might be bakelite which is brittle, and may crack if you try a set screw
 
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