I joined the round track together by just aligning the ends before screwing through them into the wood. The ends of my track were flared to allow for a little misalignment, and I took a Dremel grinder to the inside to knock off some burrs. But I do wish I had done it differently. I wish I had made thin boards out of good plywood, and aligned the ends carefully while mounting the track on the plywood, then hoisted the whole long assembly up there. Still, it works fine as is. Curious what others say.