Boolean woes.

 From:  DannyT (DANTAS)
Hi Michael,

It's only occasionally I come across problems like this, I have a work around but I thought I'd post the problem for your reference or maybe an explanation/solution.

Basically, I want to Boolean Diff the cylinder, which is only a surface, from the solid sector , I wish to keep both the sector and the resultant plug after doing the Boolean, no luck.