Chevy distributor advance limit bushing

[40cpe]

Maybe you all have this already figured out. I've been dinking around trying to get my mechanical advance limited for the flathead. I had a rubber tubing bushing that split and was trying to make something work. I was grinding a 3/16" nut down to somewhat close dimensions and dropped it. While looking for it I found a piece of Moroso 7mm spark plug wire insulation that had rolled under a cabinet. The white core measured 3/16" so I stripped the black insulation off and measured the thickness. As the picture attempts to show, the core insulation is a little off-center, making a variable thickness outer insulation. The outer insulation just fits as a bushing for the advance limit post and can be rotated to suit.