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After having my vintage Cerveny piggy worked on, the valves are now fast, but the spring tension on it feels too strong for my liking. I saw the thread about the replacement Yamaha 661 springs. Can anyone recommend a set of softer springs that would work nicely on a Cerveny piggy? My Cerveny 681 I had in the 90's had awesome valves with ideal spring tension. If I can get back to that, I'd be thrilled. Thanks

A question to you, too, and others who may have older Pigs - does your horn have the curved paddles? Mine does and I tend to slide off at times, and have gotten, thanks to a traveling friend, a set of four Czech coins(copper inside of silver) to have soldered to them, for a fancy flat surface. Anyone else have such a solution or something different?

Ike

Update: I had the tension in the existing springs softened and it made a noticeable difference.

Yes, my paddles are curved. I'm not sure my final verdict on them. They are fine. I may prefer the Miraphone ones more.

bloke wrote:Rotor springs are not like piston springs.

Any rotor springs that fit reasonably well on an instrument can be infinitely adjusted as to tension. This is particularly true with brand-new springs.

How do you do this in practice?

What IS a safe, progressive way to soften rotary spring action? The 5th valve on my Cerv 686 is is very hard.

The safe way to adjust rotor spring tension is to have your instrument repair tech do it, provide that they know how. The way I do this involves using two different pairs of pliers, and a very careful unwrapping-re-wrapping process, whereby with patience and persistence the spring tension can be adjusted to just about any desired resistance. Rotor springs very rarely ever need to be replaced.