+ sphere(r= cnr_rad, $fn=40);
+ }
+}
+
+module Stay(xbot, xtop, width, midgap_width) {
+ translate([ (xbot+xtop)/2, psz[1]/2, psz[2] ]){
+ difference(){
+ cube([ xtop-xbot, width, stay_height*2 ], center=true);
+ if (midgap_width > 0)
+ cube([ 200, midgap_width, 10 ], center=true);
+ }