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[7.5 lbs.] -- Barriers -- [1.0 lbs.]
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<--Heavy Barrel
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[5.0 lbs.] -- Stairs -- [2.0 lbs.]
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(Sorry for the crude diagram...)

7.5 lbs. - Go down the stairs and go down the small corridor to your left, you will find a barrel there that is called "Heavy Barrel". Drag it into your inventory and place it on the 7.5 plate.

1.0 lbs. - Go down the stairs and grab a candle at the base of the stairs, drag it into your inventory and then place it on the 1.0 plate.

5.0 lbs. - Just about all of the vases (the intact ones) seems to weight 5.0 lbs. so just grab one, drag it into your inventory and place it on the 5.0 plate.

2.0 lbs. - (Double 1.0) Go down the stairs and grab 2 candles from the base of the stairs and drag them into your inventory, then stack them on the 2.0 plate.

If your telekinesis skill is good enough you don't really need to drag anything into your inventory, you can just move stuff around. If it's a 1 or something, that may get annoying.

Cheers!