Posted by Willy-N [72.171.192.59] on Friday, March 13, 2015 at 23:25:02 :
In Reply to: Re: What is the purpose of the two piece frame? posted by Chad in PA [67.234.20.234] on Friday, March 13, 2015 at 23:16:43 :
It is called a double frame more flexible and stronger than a single frame just as thick.