Hi, I found an old Royal 4500 in a house I bought, and it works fine, but I need a manual, and I also need to find out how to remove the nozzle on there so I can put another on...I've pulled, pushed, and tried to twist it off...there seems to be a button under a piece of rubber on the wand, but for the life of me I can't get the nozzle off...I even sprayed wd 40 on it...seems like a great vacuum, and I'm not sure if all the features are working, but I'd just like to vacuum with another nozzle...thanks!