When you reach bag U or page 30 of the instruction manual, your beginning the process of the tank installation. It is crucial that you either ream out or drill out (with a 1/8th” bit) the holes where the tank attaches to the tank posts. The screw TKR1524 should be able to got through the tank without having to thread it. We have found that when you don’t perform this procedure that the tank is more prone to cracking and breaking. If your tank still breaks then we offer a general warranty on parts please see the link below for more information:

http://www.teknorc.com/warranty-repair/

Here are some pictures I just took for reference.

This tank had flashing left from the mold as you can see,
Before:


During:


After:


Screw falls right in with no resistance:


-Thomas