This Pedestal Carousel made of 2 - 1 1/4in pipe flanges and one 10in (or 6"or 4") pipe (each fitting either NPT or NPS threads but do not mismatch) and a 6 or 7in x 1/4in aluminum (or wood or steel) disk. 7/8in holes drilled to accept desired number of PMs This stand picture was made of brass fittings because it's heaver but black pipe could be used. If the stand isn't going to be bolted down the pipe could be filled with lead if more weight is required. I haven't found either method necessary for my stand is quite stable.
The top flange's threads allow carousel motion thus any of the PMs can be screwed to the forward/backward position. An advantage of pipe threads adjustment ,to locate the PM's position, is rock solid stability, no tilting. This stand could be bolted to the bench but I've found that unnecessary thus making it easy to moved to some more remote part of the bench when not in use.