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Have a look at the strip down topic here, that should give you some pointers.
Hi! I've got a DC25 apart right now being refurbed, here's what a complete screw set looks like[...]Might be easier to work out what screws to what parts you are missing and go from there, as alot are the same size/shared with other dysons. Bar the really short screws (which you could cut a long one down to) some screws from any other dyson would probably work.
You've done well sir, only 3 bits left!
That spring goes in the brushroll housing. You've I'm afraid for to strip it down, remove the belt and unlatch the motor from the housing (where it clips onto the sliders to meet the bottom cog). The spring goes under there and gives the belt tension. Then reassemble.
Yep you need (I call them) a cog washer under the red pedal screw. An normal small enough washer would work though.
Hose end needs a small spring and indeed the locking latch (although it'll work fine you'll have the hose falling off whenever you want to use it.
You probably need a new brushroll end cap- they always go rattly, I fit a new cap to every one that I sell and they’re always much quieter afterwards, even if the old one looks fine
Yes that one, they routinely cause noise and rattling as noted.