Renner back action question

[Thomas D. Seay, III]

Greetings from UT Austin!

This question concerns the helper springs which can be added to the 
first 20-28 bass & tenor underlevers in a typical Renner back action 
replacement. How do you set the proper spring tension, as recommended 
in the manual? More specifically, at what point in the upward travel 
of the underlever do you regulate the tension? As you know, it takes 
less tension to lift the underlevers at their rest position and the 
resistance dramatically increases as the underlever rises and fully 
engages the spring. The manual is not very clear on the point of 
travel at which the tension is set. It just says to regulate the 
tension to the recommended grams of resistance.

Any advice or help would be most gratefully appreciated.

Many thanks,

Tom

Tom Seay
School of Music
The University of Texas at Austin
mailto:t.seay@mail.utexas.edu