Opportunity is missed by most people because it is dressed in overalls and looks like work. - Thomas Edison
I like the idea of central off contact to adjust for garment issues and shims to adjust an individual print head OC and peel for special effect ink.By combining shims of varying thickness you have almost infinite OC control. A trip to the hardware store to get 1 inch aluminum blanks in 1/64, 1/32, 1/16 & 1/8th thickness. Cut to length of your screen holders and if you want to get fancy spray paint to color code for thickness.