Russian tuner kindly agreed to do the experiment using a special hammer wrench with a dynamometer.
Before a setting "Max's cardboard fix" the device shows that pin has (clockwise 7.2 against 2.4)
After a setting "Max's cardboard fix" readings from the device where (clockwise: 11,8 against : 6,2)
Next, he takes readings where his method is used, "a fix using insulating electrical cardboard " where before setting it’s:
(clockwise:7.3 against : 2,4 )
After a setting "a fix using insulating electrical cardboard "
(clockwise:15.0 against : 7,8 )
Conclusion: in some cases it is possible and necessary to use cardboard, I think
It's nothing new just a different material I use veneer
Web Master UK Piano Page
1 Old pinblock where often not only a hole, but has bush have big destroyed. In moment we have hard hammering, we may destroy holes in the pinblock.
2 A simple layman can do this perfectly if he has T-bar socket tuning lever
3 Cardboard is chosen neither accidentally. It's thickness of 3 mm is partially destroyed at the time of torsion (screwing) and the fibers of the paper fill friable microcracks it's .
3 quality hammering of a pin so that the pin is installed can making professional tuner only, I'm think
Cardboard shim for loose tuning pin:
This is a cost-effective method of fixing a loose tuning pin. It avoids de-tuning adjacent strings, which can happen with methods that involve hammering tuning pins in.
First, turn the tuning pin enough to slacken the string coils. Then, using a narrow (but strong) screwdriver or an awl, lever the end of the string out of the tuning pin hole. (This point in the string is called the 'becket'). Lever against the tuning pin itself to prise the string out.
Now unscrew the tuning pin completely, leaving the string and coils in place. From some corrugated cardboard about 2mm or 3mm thick, cut a piece 20mm by 50mm. Insert this strip into the tuning pin hole (It may be helpful to curve the cardboard round a screwdriver shaft first, to make it easier to insert into the tuning pin hole). Firmly start the tuning pin into the hole, with the cardboard shim in place. Carefully turn the tuning pin into the hole, going quite slowly so as to avoid a build-up of heat. Turn the pin all the way in, to the same level as before.
Carefully insert the end of the string (the 'becket') back into the tuning pin hole, using suitable pliers. Make sure that the string coils are kept tight, using a stringing hook or a screwdriver.
Tune the string to pitch. The cardboard shim method will keep the pin tight for years and does not involve glue.
This English translation kindly made Scotland technician David Boyce
No. It's own home piano that tuner (Kostya).
But we making this technique operation especially oldest Soviet piano. And it's work best.
Old upright piano "BELARUS"
The old Petrofs of the 80 wer not that good not as bad as the Belarus pianos we use to import them in the 80s seemed like they had oval tuning pins when you tried to tune them a nightmare Bass string overlapped the next tuning pin as well
Web Master UK Piano Page
fall board desk? Always marking "Беларусь "
On the iron plate have "диплом 2 степени " It's piano "Ukraina" or "ЧЕРНИГОВ"
And also the difference in thickness of the bushes and oval holes of a pinblockBarrie Heaton wrote: ↑14 May 2018, 19:53The old Petrofs of the 80 wer not that good not as bad as the Belarus pianos we use to import them in the 80s seemed like they had oval tuning pins when you tried to tune them a nightmare Bass string overlapped the next tuning pin as well