This is a part of Adrian's Geared extruder. Original part is a bit weak, I noticed after around 80 hours its worn out.. So i made this part a bit stronger/bigger (where possible) and the hole is not through now.The length of the 4mm inlay-rod can also be longer: 38mm and it goes all the way untill under bolts now, so the reprap parts doesnt get all the forces, but the load quickly transmits to the bolts..(We are also: www.mendel-parts.com)