Silly question but sometimes someone figured out a fast non intuitive method of doing something simple that makes you go 'crap I never thought of that!'. Mine are 60's and 70's style fluted type bushings for non collared machine posts and they are in tight. I gather using a tool to pull or push only one side applies uneven force causing it to want to tilt and lock itself in. So I was thinking thin long nose pliers to apply force to two opposed points of the bushing making it pop straight out? Any other ideas? Thanks!