Insert for spray gun paint cups

An oblique frustro-conical hollow insert for placement within a paint cup of a siphon spray gun to restrict and reduce an internal area surrounding an intake hole of a vacuum tube of said spray gun so that the insert itself, and not the paint cup may be filled with a small volume of paint for spray painting a small surface area, said insert having an open top and a closed bottom, said open top being larger than said closed bottom, and said open top and said closed bottom each having a centerline, said center lines being offset each from the other.