Angle Grinder Flap Disc Modification

I've got an old 4-1/2 inch angle grinder from Harbor Freight that just keeps on chugging away. It has a 5/8-inch arbor and most discs these days seem to be made for a 7/8-inch arbor. Fortunately it should be an easy fix to get discs with a larger hole to work with my grinder. I figure I'll just put a 7/8" diameter shoulder on the round nut to hold the larger-holed discs, and just flip the nut over to use smaller-holed discs.

I chucked up the nut in the Sheldon lathe to do the dirty work.

The shoulder was made in no time. A lathe is so handy to have for just such an occasion.

The new flap disc I bought fits like a glove on the shoulder of the nut.

Here's the finished product.