I do use the 10-32 tnuts for the DripRails so they can be flush, but for my racks I use the 1/4-20. The racks feet are 1/8” steel and the hole is large enough for the tnut to fit inside of. This is enough thickness to be able to tighten them fully.
I’d either drill out your brackets so the nut can recess into it or space it out with washers like you said.
So right now screws are tight but bracket is floppy.
Are you saying that is cause either 1) bracket isn’t flush against extrusion because interior of track nut isn’t recessed or 2) track nut has too much room inside track?
Usually if the bolt is tight but the bracket is still floppy the bolt has bottomed out against the inside of the extrusion. If you remove one you will see the scratch mark if this is true.
Thanks. Yes, I figured I would keep an eye on them.
It wasn’t the ideal situation. I needed something to add space to lock the T-Nut. I was trying to find a metal washer in town at Ace but didn’t have any luck so went with the nylon washer.
Ideally, a countersink in 1/8th of an inch in the 1/4 inch aluminum brackets would be the trick I just 1) didn’t have a countersink drill bit and 2) didn’t know what size the inside of the TNut would need to be drilled.