I am renovating an older home and have purchased four Mastic vinyl repalacement windows. They came without instructions, but I have figured out most of the steps I will need to take. However, there are two pieces of vinyl, one a u-shaped channel which seems to be made to fit the taper of the existing sill, and the other a flat piece about 3/4″ wide with a barbed flange. How are these installed?
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