Now that the batteries are working, I'd like to address the leaking packing gland. This is an ElectraCraft LSR 18 which seems very similar to the Duffy boats most of you have. What size packing should I use? The propeller shaft is 1" and when I measured the packing nut and divided the difference by 2 I ended up buying 1/8" packing but it feels way too loose. I'm thinking I need 1/4" packing but would appreciate comments.