I've always kept my beam balance assembled on a shelf on the loading bench at eye level. When not in use, per the mfg.'s instructions, I position the beam by moving the counterweight to 250 grain line then cover it with a dust cover.
Been doing it this way for about 50 years and never had a problem with this process and I do check the precision of the balance every couple of months with calibration weights. Once a year I clean the anvils and knife edges.
Tearing it down, resetting it every time you want to reload would be tedious for me and I've never seen the need to do this. Reloading is painful enough, no sense making it worse.

