Help with zero gravity brakes

purchased a set of zero gravity’s from a slowtwitcher last month. of course the “great condition” brakes are not so perfect. pivot bushing has a fair amount of play. the older silver springs are worn and don’t have the tension they should.
i went to the zero gravity web page. it is not a secure site. want to order the new spring - shim upgrade. $33.
has anyone ordered one? have you found the site secure in the order process? any one have one for sale?
thanks. chuck