set the idle where you want it, then put some jb weld in the area.

Of course if you ever wanted to change the idle you'd have to jb weld it again. This way you don't have any engineering work, no chance of accidently drilling a whole wher you shouldn't, it'll take alot less time, effort and money.

Chances are you won't need to adjust the idle again, but if you should, the jbweld could be removed.

Another thing about the jbweld, since the idle adjust is threaded, you might even be able to adjust the idle without removing the old jbweld, but just add a little more to lock it again.

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marty