It took a year to get the last set I ordered. Some changes in the family biz. They assured me though that they were still working
I ordered a couple back when Melvin ran the biz, excellent service and product. After he passed the business went downhill and in the years since, numerous revolver guys have related stories like Mannlicher's. I am inclined to believe they aren't real interested in fixing the problem.
If I wanted an original Tyler's, I'd find one on ebay. I have ordered from BK, got the adapter quick and was happy with the product. They are some kind of polymer or plastic and IMO, not the quality of the original Tyler. The BK is easier fitted and serves the purpose well.
Read the BK page well before you order.