Thick door adaptation
Long story short, I have 12 heavy steel decorative doors for my new commercial building. I bought them a year and a half ago and due to delays in construction they have been in storage. The doors are 3-1/2" thick, but the handle sets and deadbolts that came with them are (incorrectly) for standard doors of closer to 2" thickness. I am beyond the timeframe to make returns, and to avoid having to buy lock/handle sets a second time, I am hoping to convert them myself using longer machine screws, and extending the spindles using the correct length of added spindle rod with sleeves. I'm struggling with the tail piece on the deadbolts. Have you seen anything like this example before? It looks like the toothed nut-looking ring should come off in order to release the tail piece, but I haven't tried anything other than fingers to avoid damaging it.
Two questions. 1- Does it come apart? 2- Where do I find longer tail pieces?
As a last resort, how can I extend the existing tail piece?