Kirby model gd3

Question

Hi,

I inherited a Kirby model gd3 Vacuum cleaner. It seems to work fine, but the handle will not stay up. It falls to the floor whenever you let go. I was thinking that I need a handle spring assembly part #K-671901 but I do not have a manual and there is a switch at the back of the unit that has no apparent purpose. Is there a way to getting it to stand up without a repair???

Thanks,
Terry
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