I reckon let it go till she blows!! ;D
Machines like that are designed as a throw away item, and I know how difficult that is to hear...
Do yourself a favour, spend the $150-$200 on a new Sunbeam grinder, and have the best plunger coffee you have ever had.
Save your pennies and buy an espresso machine that will set you on the road. I reckon you cant go past the Gaggia Classis, you can get it for $550 on special, and will last you a long time. You can buy spair parts for it, and it is easy to use, and makes great coffee.
After five years or so, you can decide if you want to step up to a Mazzer Mini or Rocky, and match it with a Silvia or better.
The other option is to buy the GRinder, then spend $200 every couple of years on sunbeam/breville, etc.
Whichever you are happiest doing. Be warned though, onve you start on the road to coffee nirvana, there is no going back!!! :D