Originally Posted By: NHGUY
Should be nylon insert nut,or a crimped nut....in effect a locking nut.The imports have used those since before the Beetle days.
Agreed. I've put many of them in and they'll always have a friction or nylock nut. Like NHGUY said, they've been OE on many applications, so even if your OE app was a castle nut and pin, I wouldn't think twice about running this setup.