Hi Frederick,

re:
> BTW, is my method of creating the tapered end legit?

The general concept of creating the tapering by submerging a surface is legit, you just need to do it a bit more.

Currently your thread surfaces are just barely skimming along the outer surface of the cylinder.

That type of "barely skimming" shaping is difficult to boolean.

Instead of that you want both the tapered end and also the non tapered area to push down into the cylinder's surface with some margin instead of trying to make it barely skimming along the cylinder's surface.





Making those areas push down through the cylinder a little ways will make it easier to boolean.

- Michael