Applications for such washers crop up now and then. I've gotten the larger sizes (1/4" and up) at The Home Depot. If you save the knock-outs from electrical boxes, you'll have the makings for 7/8" diameter washers on hand. The knock-outs are suitable for screw sizes 6, 8 and 10, though they border on being a bit too large and ungainly-looking for No. 6 screws. Here's a photo, with one knock-out done as a No. 8 washer:
For rough work, you can just eyeball a centre punch position and drill the thing. For a good appearance, use a centre-finder to spot the true centre, drill a 3/32" pilot hole followed by the requisite size of drill for the screw. Deburr the hole and file off the burr that's at the edge from breaking out the knock-out.
Hole sizes are as follows:
No.6 -- 9/64"
N0. 8 -- 11/64"
N0. 10 -- 13/64"
A drill press vise makes drilling the things easy. Here's how it looks in action:
I wouldn't care to have to make 100 of the things this way, but for my usual requirement for one or a few, it's not at all impractical to do. And the price can't be beat; saves me money to spend on essential bad habits.
For rough work, you can just eyeball a centre punch position and drill the thing. For a good appearance, use a centre-finder to spot the true centre, drill a 3/32" pilot hole followed by the requisite size of drill for the screw. Deburr the hole and file off the burr that's at the edge from breaking out the knock-out.
Hole sizes are as follows:
No.6 -- 9/64"
N0. 8 -- 11/64"
N0. 10 -- 13/64"
A drill press vise makes drilling the things easy. Here's how it looks in action:
I wouldn't care to have to make 100 of the things this way, but for my usual requirement for one or a few, it's not at all impractical to do. And the price can't be beat; saves me money to spend on essential bad habits.
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