i modified my toothbrush slide in v1 by tapering the end, instead of using a screw and nut.
just 2 pieces now so all you do is slide the rod onto the frame. slide the end with the knob in first, then the other end for easiest assembly. you will need to flex the frame a little but its not enough to break it.
frame has flat spot to lay on the bed.
knob/rod has little supports in the design to keep the rod from separating during print,. print the knob/rod vertical, flat of knob to the table.