Duraspark Dizzy for a 170. Can it be done?

[Lazy JW]

I'm waiting for an excuse to pull the pan, then I'm all over this swap.

I don't have a lathe, but I have a vise, and figure I can spin the shaft with a drill and use a carbide burr on a die grinder to reduce it down.

I would definitely stay away from it with that die grinder. When you use a file, your mistakes will be relatively small. Not so with the carbide burr bit

I wasn't thinking of spinning it with a drill but that would be a good method. A file and a micrometer would do the trick quite nicely.

I was figuring to use the old gunsmith's method. With the workpiece secured in a vise, file a small flat. Measure so that you only go about .015" deep. File a flat just opposite the first. Measure. Turn 90 degrees. File another flat. Then oposite that one. Now file an octagon. Then 16 sides. Then 32. Get the picture? Finish with emery cloth in a shoeshine motion. You wouldn't want to bet me any large sums of money that I couldn't make it work perfectly. But then I have had a bit more practice with a file than most.
Joe

 

[jamyers]

...I would definitely stay away from it with that die grinder. When you use a file, your mistakes will be relatively small. Not so with the carbide burr bit

I wasn't thinking of spinning it with a drill but that would be a good method. A file and a micrometer would do the trick quite nicely....

Oh yeah, a carbide burr will take a big bite if you're not careful! Not for the ham-fisted...but I've been getting a LOT of practice lately on some Buick 455 heads, and have gotten pretty good at small cuts.

Still, I think you're right, a drill and file should do just fine.