Leaks from the bottom of the glass jar. Bought a new gasket and it is worse than ever.

It will either be the rubber gasket (it goes between the glass jar and the blade assy) or it could be a worn bearing/bush around the chopping blade shaft. Replace either the gasket or the blade assy.

A couple of things you can check.
Unscrew the glass jar from the bottom.
Check to see if the grey seal is between the metal blade assembly and the glass jar. I had this issue and it turned out to be that a friend had reassembled the blender jar parts after taking it apart to clean it.

I'm no expert but in my experience if it leaking at the bottom then either the jar /carafe has a few chips or cracks around the hole in the bottom that the blade fits through and in that case you need to replace the jar and your blade assembly may still be good and can be moved to a new jar/carafe. Or the blade assembly has come loose a little and need to be tightened or some the washers (usually the rubber ones) have worn out and need to be replaced. There's plenty of explanation here at amazon and else where on how to replace the assembly blade, move it to a new jar and tighten it down, etc. Hope this helps!

remove the screw on blade holder, and make sure the gasket is in place ,, check the seal on it,, if its defective replace it,, check along the threads to make sure that the canister isn't cracked

The gasket goes between the plate to which the cutter is mounted and the base of the jar. i.e., atop the cutter and contacting the base of the jar.

Charlie

sometimes you can post what you are looking for on Ebay and wait ,there are companies that have new and used for Demos very cheap too >^.^<

It looks like their parts are handled by Fox International. here is the contact info:
For parts and accessories for your household appliance, please visit our partner, Fox International, or use the following.
Phone Number: 800-738-0245
(Monday-Friday, 8:30 AM to 8:00 PM, E.T.)
Email: [email protected]

Here's the parts order form from Waring:
http://www.waringproducts.com/ret/parts/

Once you receive the parts, unscrew the collar from the bottom of the jar, and the old gasket and blade assembly will pop out - sometimes you have to peel the gasket apart from blender jar, but not always.

-Tha Mp3 Doctor

Mine also leaked from day 1. I just read in the manual to first place the bottom and blade assembly on the counter, then seat the gasket around the blade assembly, making sure it is just under the lip of the blade piece (careful, you have to maneuver around the blades). Then place the jar on the assembly and screw in tightly. This worked and I have no more leaks.
This is different than other blenders where you place the gasket on the jar and then attach the bottom. It is a poor design, but after what I paid for it, I am glad to be able to use it and not just trash it.

I just figured it out. The key is you need to think in terms of keeping the blades and the large washers separate. Here's what you do.
Thread the blade through the glass and use the white rubber gaskets against the glass and the stainless gaskets against the hardware. Then tighten the whole enchilada to the blender with the main nut (that goes on the bottom outside of the blender). Then once that's nice and tight tighten the flange that catches the blender teeth to the remaining portion of the protruding threads. Make sure you use the copper colored gasket first then the stainless washer then the stainless flange. Tighten that real good and you should be good to go.
To check if you've done it right spin the flange. If the blades spin independent of everything else you're good to blend away!