The next challenge for
@Solarfun4jim with that flanged grub nut with the larger threads on top is how to get enough torque without exceeding the rating of the terminal top.
According to the table on post #2096 the torque for a 8mm thread is 10Nm and the terminal top is not to be twisted with more than 8Nm of torque. With a buss bar taking some torsion it might not be a problem but on a single positive or negative terminal, one might need to hold the main power lug to keep the terminal from rotating with that amount of torque.