fix tube angle and diameter

bracket.scad

@@ -8,15 +8,15 @@ t=6;   // thickness, mm
 difference()
 {
     translate([0,0,-10])
-    rotate([0,-26,0])
+    rotate([0,-16,0])
     difference()
     {
-        cylinder(d=27, h=75);
-        cylinder(d=21, h=75);
+        cylinder(d=29, h=75);
+        cylinder(d=23, h=75);
     }
     translate([-25,-25,-20])
         cube([50,50,20]);
-    translate([-55,-25,50])
+    translate([-45,-25,50])
         cube([50,50,20]);
     translate([0,0,45])
     rotate([0,-90,0])
@@ -31,8 +31,8 @@ difference()
     translate([0,3,3])
         cube([50,9,9]);
     translate([0,7.5,-10])
-    rotate([0,-26,0])
-        cylinder(d=21, h=75);
+    rotate([0,-16,0])
+        cylinder(d=23, h=75);
 }
 
 translate([50-t,0,10])