Hi Craig,
A quick and easy way to sort this problem out is to use clear fish tank air hose. It works perfect as i just checked and it's a snug, tight fit ( you just have to be careful as there's 2 type of sizes used...just take your wiper washer with you i guess ). It's cheap as chips and you can get it at variety stores, Pet Stores, BigW, Kmart or sneak some off your mates fish tank when he's not looking
but it will do the trick for you... im going to use it
hope it helps you out Craig
"Have A Great Holden ( FE ) Day !!!"
FE 4 ME