Added cylindrical adapter

brake_fluid_bottle/brake_fluid-ss9_front.scad

@@ -0,0 +1,30 @@
+// print with 10% rectilinear infill
+
+$fa=3;
+$fs=0.25;
+epsilon=0.01;
+
+shell_dia=49.5; // inside diameter of front brake fluid reservoir top
+shell_thk=3;    // shell thickness
+shell_hgt=8.5;  // height of lip
+bolt_off=20;    // bolt offsets
+bolt_dia=4.1;   // bolt hole size
+bottle_dia=20.6375;
+
+difference() {
+  // main body
+  cylinder(h=shell_hgt+shell_thk, d=shell_dia+shell_thk);
+  translate([0, 0, shell_thk]) {
+    cylinder(h=shell_hgt+shell_thk, d=shell_dia);
+  }
+  // bottle hole
+  cylinder(h=shell_thk, d=bottle_dia);
+  // bolt hole
+  translate([0, bolt_off, 0]) {
+    cylinder(h=shell_thk, d=bolt_dia);
+  }
+  // bolt hole
+  translate([0, -bolt_off, 0]) {
+    cylinder(h=shell_thk, d=bolt_dia);
+  }
+}