I've got this old CB500f that's been sitting for about 2 years, it wasn't properly stored, but it seems like it's in really good condition. I removed the carbs intending to break them down and soak them in a can of Berrymans a friend has loaned me. I've got the carbs apart, but I am a bit stymied getting the 'needle jet' and the 'needle seat' without tearing up the soft brass. Any suggestions?