Impeller broken.

Silicone isn't strong enough. I don't believe Wardley is a manufacturer but rather a brandname just like Craftsman and Kennmore don't build anything. If you can find the true manufacturer that may help. If it is made by a common manufacturer of other magnetic pumps you might be able to match it up visually if your lfs, has a good selection of filter parts. However this is a tricky "long shot" as subtle differences can be the difference between one that works and one that doesn't. You have to have yours with you to compare all dimensions, and design of each component.

I looked up those filters, and although they are discontinued, it was a pretty neat idea to incorporate a small fluidized bed filter in an all-purpose HOB.

There are a couple of them on ebay now, so you might be just as well off buying a replacement as you might be tracking down an impeller. I believe Wardley's is a part of Hartz and you could contact Hartz and see if they can send you an impeller. Heck, if you get on the phone with a very helpful customer service person, they might just send you a box of impellers just to get them out of the warehouse.

You could try the generic impeller thing, just be sure to take the one you have with you for comparison. WHen I bought my used tank and accessories, everything was all nice and clean, but for some reason, the guy put all the impellers for everything in one bag, and it took a while to figure out which would work in what. Some equipment would work in anything, but one picky piece of equipment would only work with one certain one.

i've used impellars from other filters on one of my pengium 330's, in the 5 years i've had it the impellars broke 3 times, ive used one from a cascade, and i forget which other

you could probably buy another one that looks similar, it would probably work