<html> To weaken a wip assist spring I slip my normal spring adjusting tool behind the loop right in front of the coil and lift. To strengthen, disconnect loop, hold tail with small screw driver and lift  the loop. Regards, Jon Page At 02:02 PM 09/14/2000 -0600, you wrote: <blockquote type=cite cite>I haven't dealt with the Renner turbo-spring, but have had occasion to adjust tension on wipp helper springs on various asian models (Samick, Young Chang, etc). I have to say, trying to weaken springs in situ (wipps on rail, backchecks in the way) is problematic, and, try as I might to adjust tension of the coil, I have found I mostly can't get them weak enough in an efficient manner. So I bend them using a 45 degree damper wire bending tool. Gets in there pretty efficiently, a lot easier than a needlenose. <x-tab>        </x-tab>There is good reason for the prejudice against putting bends in springs, but it mostly applies to the Steinway style butterfly, and upright hammer return and damper return springs, which have a curved surface rubbing against a groove. Adding a bend changes the geometry, altering the way the curve of spring meets the groove. <x-tab>        </x-tab>In springs like the wipp return, with a kink catching a string loop, I can't see that it makes any difference whatever if there is a kink in the spring wire, as long as it isn't extreme. Regards, Fred Sturm University of New Mexico Mark Cramer wrote: > > "Tension has to be adjusted on a spring at the coil, as has already been > pointed out." > > Cheers > Mark Bolsius > Bolsius Piano Services > Canberra Australia > > Thanks Mark, > I'll clarify the question, as you may or may not have seen the booklet Lloyd > provides with the "turbo-wips." > > Against our best judgement, the diagram shows a pair of needle-nosed pliers > gripping the spring half-way between the coil and the hook.  The caption > reads "place a small bend here." ----- > > Mark Cramer, RPT > Brandon University </blockquote></html>