Some times I need the ability to mount an axle at the end of a rod.Slip this thing onto the end of a rod and you can then put an axle through the separated holes.This is a nice piece to help form a swivel joint between two different rods.The default size fits a rod with an outer diameter (OD) of 11.34mm (some carbon fiber tubing). The holes where an axle would go through can accept 1/4".These are easily configurable in the OpenScad file.UPDATE: 11022011 Changed the file slightly to have a better taper at the top.1) Select a bore hole size for your rod 2) Alter the OpenScad file to match 3) Print some of these out 4) Slip a dowel pin of the appropriate size into the open holes 5) Hook something interesting onto the axle. 6) Rejoice!