If it is an area where you absolutely cannot use heat; then an air hammer wrench is your best friend.
(Opinion, others will differ) there is no penetrating liquid available that is as effective as either heat or an air hammer wrench.
Jon.
Good carburetion is fuelish hot air The most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes! The Carburetor Shop
