Information_schema.columns

Hi:

I need to change a column default to '' and not null for 1500 databases accross 10 servers.

if exists (select * from information_schema.columns
where table_name = 'tblABC'
and column_name = 'columnX'
and data_type = 'VARCHAR'
and is_nullable = 'No'
and column_default = '('')'
)
begin
--do something to implement
end

Here, there is a problem for and column_default = '('')'
I have tried ''''+'('')' + '''' or "'('')'", neither works.
Do you have any idea to deal with the ('') ?

thanks
-D