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Step 1: 1/4 20 - Socket Cap Bolt and Diy Plate
There's not much to say about this little diy plate except that you can make it in minutes.
Hot Rolled 1/2 steel - You can can get this at any bigbox or order it here (.59c for 12")
Socket cap bolts - the ones shown here are from 8020 as they were left over, however you can use any 1/4-20 socket cap screws with a washer if required. These are 1/2", yet 5/8" lengths should work.
You only need to drill and tap two holes on 1.5" on center or what ever distance fits your application.
Step 2: Socket Cap and Square Nut - 5/16
The square nut fits quite nicely in the slot. You must use a washer since 3/4 will push into the back of the 8020 rail. (I assume a 5/8 length bolt will work fit perfectly, yet did not try it.)
Here are the parts. I purchased mine from Lowes but I've added links to online sites.
5/16 Socket cap @ 3/4
5/16 Lock washer
5/16 Square Nut
Step 3: Carriage Bolt 5/16
A 5/16 carriage bolt works great too!