I can use the rollerball to move the cursor around on my 8130, but when I depress it, nothing happens. I took it apart and cleaned it really well but it didn't help. It just started happening, no problems at all before now. What to do?

Got it working! When I cleaned it before I just swabbed it out with a clean Q-tip. It really wasn't that dirty to begin with. The second time I used rubbing alcohol. Didn't seem to remove anything but it's now working so that's all that matters.

Does anybody know where I can get a new rollerball asssembly just as a backup?

here you go

8100 8110 8120 8130 Pearl : HorizonWirelessOnline.com - Horizon Wireless, Canada’s Cellular Repair Center ß

and here you go

Cellular Accessories - SonyEricsson, NEC, Motorola, Nokia, Panasonic, Sanyo and Samsung. Quality housing, keypads, LCD screens, chargers, batteries, data cables, parts

The Roller Ball On My Curve Stopped Scrolling. At&t Said Tough Luck, 5 Days Out Of Warranty.
They Were No Help, Said You Could Not Do Anything About That Problem. After Resigning Myself To The Fact That I Was Going To Have To Buy A New Phone, And Maybe Switch Carriers I Decided To Go For Broke. I Removed My Battery And Used A Can Of Spray Electrical Contact Spray. I Saturated The Roller Ball While Moving It Continuously. I Allowed A Few Minutes For The Cleaner To Evaporate, Reinstalled The Battery. The Roller Ball Now Works Perfectly!!!!! Try It. And Let Me Know.

Try Using Spray Electrical Contact Cleaner. First Remove The Battery,saturate And Keep Moving The Roller Ball. Let It Dry For A Few Minutes, Reinstall The Battery. You Should Be Good To Go!!!!!!!!