I found a new product from a Canadian TV installation professional (leslievillegeek) which looks great and seems easy to install. Offers lots of flexibility, able to pull out from the pillar, and goes back close. no tools required for the install. No drilling into pillar, means no structural interference. Its a patented method which these guys invented and perfected after installing 100's of them. Looks really steady and strong. The strap they use can withstand 4000lbs.
On backorder until September 2018. I have sent my name to be put on the wait list.
