The usual way. Drive a sheet metal screw into the metal part, grab the
head of the screw with a pair of vice grips, and yank.

Ron wrote:
I need to replace the oil seal (06A19956 or STD208) in the vacuum pump
adapter (61098) on my Lycoming IO320. How can I remove the existing
seal without a special Lycoming removal tool?

The oil seal is .875" ID x 1.5" OD x .3" thick.

ALL suggestions taken seriously

Thanks