In the beginning those of us who posted about our Spuhr failures were often told we didn't know what the hell we were doing, we must have been overtorquing them, our torque drivers were messed up, we must have been putting grease on the screws, etc. Basically everyone who liked Spuhr wanted to blame everything but the mount itself and was ignoring the growing evidence of a design/material problem because they didn't want to admit the product they liked and spent good money on might have an issue.
Later, some of those same people who had been defending Spuhr for years and trying to pass the blame onto the installer and who had been telling those of us who experienced failures that we didn't know what we were doing experienced a failure or two themselves and suddenly they started dumping their own Spuhrs they had defended for years and started jumping on the bandwagon saying they were crap... funny how firsthand experience changes their tune. One of our more vocal know it all members here went so far as to say (summarized): "you are all idiots and Sphur is too, mine have never failed, but I only tighten the clamp bars to 25 in-lb because that's all they need and Hakan was an idiot for specifying 45 in-lb in the instructions, you have to be smarter than the engineers." Frank himself then blasted that guy for moving the goalposts when he flipped from defending Spuhr to bashing them after witnessing a few failures (and it was fun to see how he responded to Frank, lol.) Frank also said it's been a known issue for years, confirming something many of us have known for a while.
I had 5 out of 11 of my Spuhrs crack the clamp bars over the time of about 10 years, from when I bought my first one back around 2012 until around 2023 when clamp bar #5 cracked and I finally decided I had enough and sold them all off because I was tired of warranty exchanging clamp bars after pulling a rifle out of the safe to go shoot and finding yet another cracked clamp bar.
It's luck of the draw, too. A friend of mine has 6 Spuhrs still in service (3 mounts, 3 sets of rings) for about the same amount of time that I used Spuhr and has had no failures at all. The funny part is, I installed all of his scopes into those Spuhrs for him using the exact same methods and torque driver that I used on my mounts that had 5 out of 11 clamp bars crack... so maybe it's my rifles that are cursed, lol
I saw a recent thread here where someone bought a new Spuhr and it came with steel clamp bars, but they commented that the steel clamp bars put divots in their scope rail.