add cad

README.md

@@ -38,6 +38,12 @@ Ok, through some of this ...
  - consider similar structure & method (alu tabs with 3dp heatset inserts to secure) for bottom lock-in ...
  - plate
  - fin
+ - luer lock
+ - vol / step ? haha
+
+ - ballscrew: flip flange side,
+ - instead of an o-ring seal, use dam-type flange wall?
+ - or o-ring gets a nest, for slightly oversized o-rings ?
 
 ## The McMaster Order