Where can I get a copy of the owners manual for a Regina 1000, model HO 6131 vacuum cleaner, or can you tell me how to open one in order to clean it. I am embarased to admit I can't figure out how to get at the bag or dirt collection space. I volunteer for a charity that repairs donated appliances for redistribution to the poor. Most vacuum cleaners I have been able to figure, but this one has me stumped.