Replacement rod for Rhino Coffee Gear's Thumpa knockout tube
To see the replacement rod and cover being replaced, have a look at Rhino Coffee Gear's 26 second demo:
Tip from the manufacturer: should you be having trouble joining the Thumpa rod and rubber sleeve together, please do not bang them together. This friction can cause the two parts to bind together. Instead, apply a small amount of olive oil or other food grade lubricant to the parts and join together.