I got to aggressive in trying to remove the lead and oakum from an old cast iron bell in the stack for my toilet. It is just cracked in the top of the bell end (no pieces missing) and I am planning on using a neoprene collar to replace the old lead pipe with ABS. Can I do this or do I have to worry about leaks? Can I use the neoprene collar and clamp the bell with a SS strap clamp? Any experience appreciated - Thanks!