I used the same washer/plus nut system as BobATX. Thanks BobATX! It works well. When I did not use washers I had spinners in my trial on 1/8" aluminum stock. With washers no spinners.Thanks. This is great info. Not looking to go back and forth, but I do have one observation that leads to a few questions. It's interesting that the typical 3/8 internal tooth washer id spec is about 0.384, bit smaller than 0.390 hole spec for the plus nuts, but perhaps because of the tooth shape there may have been enough clearance (smush room) for the shoulder on the plus nut (if it is a brand that has that shape). No doubt creating a thicker surface is the key (and possibly only) factor that matters.
Do you know what make plus nuts you used, or at least the supplier?
Did you happen to notice if the washer would sit flush with plus nut flange when you pre-assembled them before applying any pressure with the tool?
Also what tool were you using?
Maybe I can help with your questions.
The washer fits nice and flush on the plus nut and has wiggle room.
McMaster 91757A113 3/8" stainless washer
McMaster 97217A393 1/4-20 plus nut. I tried M6 plus nuts since they are the size of some van holes but they didn't work well for me. These are more expensive than some Amazon versions. I tried less expensive variety and had trouble with them cross threading once installed.
Astro 1450 https://www.amazon.com/dp/B01JBNNJ3Q/ref=cm_sw_em_r_mt_dp_MXZNW1FM815KC2H8XP5B?_encoding=UTF8&psc=1
I had to practice on 1/8" aluminum to get the right length on the tool and a feel for the right pressure. Turns out I have to do one "pull" then extend the arms again using the set screw and then a smaller pull which finishes it off.
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