You might (scratch that, definitely) want to coat the tip in some KY jelly to assist in insertion. Hang the hot water bottle (which should have a hook on it) on the showerhead.
Their heads consist of a massive black armored beak, which is used to push aside the dirt whilst digging.
First introduced in the 1990 film Tremors, Graboids are depicted as subterranean animals, superficially resembling gigantic worms or grubs, with long cylindrical bodies.
When fully grown, a Graboid will be up to 30 feet (9.1 m) long, and 6 feet (1.8 m) across at the widest point, and weigh 10–20 tons.
The beak opens like a grotesque flower; it consists of a wide upper jaw, a thinner lower jaw, and a pair of hooked mandibles, one on each side.
In Tremors 5: Bloodlines, they are reported to have a semi-rigid internal structure, such as that the cuttlebone of cuttlefish.