another option you can try with studs. there are several versions of steel locking nuts, some with deformed threads near the top of the nut, and some with indents on three sides. those might work.
do not use nylocks or those with nylon buttons for obvious reasons.
i call these things "mash nuts" because they grab the female threads.
there are correct names for these critters, but i can't remember them. [CRS]