Melling Engine Parts supplies tools for installing press-in type oil pump screen assemblies. The pumpbody should be placed on a small block of wood with the tool straight up and down. Start the screen straight into the hole by twisting and turning by hand before pounding. Under no circumstances should the screen or oil pump be held in a vice. This will lock up the pump by crushing the gear pocket.
The tool can be tapped with a hammer until the rolled bead on the collar of the screen tube is flush with the oil pump. This is a metal displacement press fit that only works once.