How to ease a stuck sink holding ring?

I have a leaking cloakoom sink & wanted to remove the basin waste/plug hole to add some sealant and refit.

I got the U bend off OK, but I can't seem to remove the large plastic nut holding the waste pipe to the sink. "Holding ring" I think this is called. It's 2" wide I can't find anywhere that stocks a calipers or wrenches that wide. The nearest I have is stilsons & they're too unwieldy as the ring is quite narrow.

Any advice?

Thanks in advance.

drain

Usually the best fix for something like that is to remove it (using a hacksaw if necessary), throw it in the waste bin, and install a new one.

Hammer and chisel to get a turn started. Might need someone to hold a pair of pliers into the strainer basket from the top. But they do make wrenches this size that are made for this application. I haven't needed one but they're out there. They even have a little notch to get a firm grip, too.

http://www.lowes.com/lowes/lkn?action=productDetail&productId=118902-14470-03020

http://www.toolsforplumbers.com/ProductDetail.asp?Product=21633&AffiliateID=ShopzillaTFP

hj said:

Usually the best fix for something like that is to remove it (using a hacksaw if necessary), throw it in the waste bin, and install a new one.

Click to expand...

Yeah, did that

Used one of these in the end too:

http://www.ultimatehandyman.co.uk/diy/plumbing/basin_waste_fitting.htm

worked great

drain

PLASTIC? I consider a plastic lavatory drain a temporary repair, and the way that "thing" works it should have caused a leak because it apparently puts NO pressure on the center around the drain thread which is where most leaks occur.