Creating verts along intersection between two objects

[puzzledpaul]

The simplest option that most will suggest is to use The ML Boolean, after producing the 2 relevant objects (glass bulb + threaded cylinder)

However, if the top end of the threaded cyl is left as a cyl, then the task is simple, since both objects then have a circular cross section, and (especially) if they have equal vert counts ... just use bridge.

To make a reasonable thread (imo) you'll have to modify the spring tho - one approach mentioned below.

Even simpler, btw ... is to make a std UK type bulb ... with a bayonet fixing

pp


http://www.wings3d.com/paulthepuzzles/springthread.html