12-gram Seals

If there is any of the old seal left, remove it with a dental pick or a jewelers screwdriver. The new one will look larger than the cup it has to sit down in, that's no problem, it's soft...

With the pick/screwdriver, gently tuck the edges of the new seal under the lip of the cup and press it down flat.

Here's what it looks like with the seal in.....

An oring may work as a temporary fix (never tried it myself), but what you need is a new seal. The installed one is white in the picture, a new one is shown on the lip in this picture..

Hopefully this helps.....