Trim ou Boolean Solids

Hi, I’m trying to trim those 2 polysurfaces or boolean, the thing is, I’m try to Join then in one and the extruded part which goes inside the hull should be removed.
Any Ideas?c60_cb7_bulb.3dm (282.7 KB)

Hi Dean - run Intersect on the two objects - Invert Hide to isolate the curves. See how there is a line at the bottom where the two objects are coincident or nearly? Explode the curve and delete these ‘lines’, Join the rest and use the curves to trim the two objects.

Any luck?