The 4th distributor is on the way. Over the past 4 years, I have been breaking off the "ears" that connect to the drive in the block. The first one was very old so chalked it up to that. The next had drifted up in the collar so thought it was that (at the National Rally Leadville 2017!). After the next, I replaced the collar with the newer thinner type as the old one had a stripped thread to hold the diz still. Now, it happened again!
I did the rebuild in 2003 (with tremendous help from the LRO Digest and Green Bible) and have maybe 20k miles on it with excellent oil pressure. So- the first 12 years were fine. What ever could be happening now? -Rik in MN 1960 SWB SW w Ser III block