So, using the Titan #1 on a .22 cal sidelever Diana you can reach healthy power levels (on the lower side) - who'd thunk it? The answer is this: British tuners who have used the Titan #1 as a multi-purpose aftermarket spring for years have recently learned that Knibbs, who make the Titan springs, have increased the #1 wire thickness so that it's simply not feasible to use anymore in a 12 fpe context. But the Titan #1 is still marketed and sold as a British-spec spring for the Dianas (although never claimed to be a direct replacement).
While the 52L powerplant has been fixed for now, not so with the sights. The OEM all-steel rear sight has developed a sizeable cant for some unexplained reason (see pics). These sights are pretty different from the present Diana rear sights or rear sights in general, in that they don't have a separate spring providing the tension for the height adjustment, but the sight base itself continues as a U-shape leaf spring into the top, moving part of the sight. It's all one piece. There is no room to force the sight top level, as the integral sight base gets in the way well before the elastic limit of the steel would be breached.Heating the leaf spring portion would enable shaping, but also destroy the tempering of the spring and the looks of the sight.I definitely don't want to lose to sight, but don't know how to fix it, either.
Thanks, HectorGood question. Going through my notes I wrote about the tilted / canted rear sight last summer, after sighting the gun in after the latest bout of tuning. But was it there before that? So far, the 52 has spent most of its time on the workbench, in the break-in, and at the chrono, where sight geometry just doesn't come up. Curse 'em incomplete notes! The 52 has never fallen or been impacted in any way under my ownership. It resides permanently in a heavy-duty gun slip. The only thing I could frame as an external reason would be the gun traveling, inside its thick gun slip, in a fully-packed car, somewhat under load (but even then, a lateral load). I'd never thought that could mess up a steel sight on a cased gun, but...There is nothing between the steel sight base and the receiver tube, never has been. I don't see a shim piece on the D52 T01 parts diagrams, either. Could you provide a picture of the missing plastic piece? Is it a long, continous shim or a couple of short pieces? However, the sight tightens down appropriately and doesn't move laterally. It is the sight itself that is out of plane, although I fully understand even then the sight needs to be built on a solid foundation.
The Titan #1 has always claimed to be "Std. Power". Nowhere in the documentation says "UK Power",
Respectfully, that's lawyer talk. When a UK company produces springs with descriptions of 'Standard (power)' (Titan #1 for the sidelever Dianas) and 'FAC' (Titan #4 for the sidelever Dianas), it is inherent in the description that the two categories correspond to sub-12 and over-12 foot pounds of muzzle energy, or the only meaningful categorization in this context. When you ask the British airgun part suppliers about their kits' output, the answer is they are Standard power, which means they are sub-12 fpe. For the sidelever Dianas, these kits are often supplied with a Titan #1.That the actual output of a gun is highly dependent on multiple factors outside mainspring choice does not invalidate the above categorization.
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