This question below that someone else asked fits my situation. One of the answers said to use double wedges. What are those? How can I raise the railing slowly so as not to break or crack the existing composite railing?
The original question: How to fix sagging composite deck railing
I have a composite deck (Fiberon boards with a Trex Designer railing system). The guy that built the deck didn't install any of the crush/foot blocks and now the railings are sagging. He's no longer in business, so now I need to try and fix this myself. I found a place online https://www.diyhomecenter.com/trex/transcend-railing-adjustable-footblock.aspx that sells the adjustible foot block, but I don't know if that'd do me any good. How can I install the footblocks now that the deck railing are already in place?