On my '79 Alfetta, the tube that holds the dipstick is loose. It spins easily and has a tiny bit of up and down play. I think I am leaking oil there, and I'm wondering (1) how this tube is attached and (2) how to secure it? I thought maybe it was threaded, but there is a tiny hose connection on it that prevents my spinning it all the way round. Does anyone know how to secure this, or how to remove it and improve the seal? Thanks!