V-Baby Bed Support C - Adjustable

I'm a big fan of reducing the X & Y Carriers to the absolute but reasonable minimum. With the 3-point leveling system on the V-Baby and a good quality flat bed, you should be able to set your leveling and then forget it. See this excelling article from Mark Rehorst about it: https://drmrehorst.blogspot.com/2017/07/3-point-print-bed-leveling-vs-4-point.html

So to start, I've remixed the stock stationary support to include an adjustable platform with the same thumb wheel the corners use.