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Topic: Problem changer finger |
Michell Geerdink
From:
Netherlands
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Posted 1 Jun 2019 9:07 am |
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Hi all,
Here's the problem. On my MSA the e's are lowered by rkl. Now, string 8 will somehow not lower entirely from e to d#
On this video i tried to show what's happening:
https://youtu.be/rUM0NfRl4xo
As you see, first i block the bottomfinger with the screwdriver, resulting in more than enough lowering. Now when i don't use the screwdriver the bottom finger will try to raise halfway the travel.
Anyone that can help me with this? What can i do?
I applied just a drop of oil at the pivot point but no result.
Thanks in advance,
Michell |
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Georg Sørtun
From:
Mandal, Agder, Norway
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Posted 1 Jun 2019 10:43 am
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That is a typical "lower return to raise", and it shouldn't be that way.
How to deal with it…
1: if you have a "raise helper spring" for that string, remove it permanently.
2: if there are holes lower on that lower scissor, move the pull-rod as far down - closer to the "lower-return spring" - as you can and tune it back up again with the nylon nut. May have to move the rod to a different position on the bellcrank too, to be able to adjust the pull correctly.
3: if there is adjustment on the "lower-return spring", release it so it barely is able to keep the lower scissor in place against the stop-plate during open and after a raise. |
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Michell Geerdink
From:
Netherlands
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Posted 1 Jun 2019 2:05 pm
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Hello Georg,
Thanks for the reply,
You helped me solve the problem.😃
Moving the pull rod to a different hole in the bell cranck, and go from lower 1 to lower 2 in the changer did the trick. Just like you decribed in your suggestion 2. I'm all happy again. Thanks for your help.
Michell |
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Georg Sørtun
From:
Mandal, Agder, Norway
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Posted 1 Jun 2019 2:53 pm
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Glad I could help  |
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ajm
From:
Los Angeles
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Posted 2 Jun 2019 8:14 am
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The problem is solved. That's good.
But in cases like this I always feel that there is a part of the story that is missing.
Did it work at one time, and now for some reason it doesn't?
If so, what changed?
Or did it never work?
Maybe you got this guitar recently and discovered this?
Or........? |
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Georg Sørtun
From:
Mandal, Agder, Norway
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Posted 2 Jun 2019 11:50 am
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| ajm wrote: |
The problem is solved. That's good.
But in cases like this I always feel that there is a part of the story that is missing. |
OP will have to answer those quite interesting "when and what made it fail in this case" questions. I will only touch on why 'lower returns to raise' can happen at all, as this case is not unique.
On this type of all-pull design there is a built-in weakness, as the lower return spring is below the pull-rods and will inevitable become a pivot-point when tensioned too much by a long lower pull. That's when the lower pull gets transferred to the raise scissor and cannot lower any further.
To eliminate this tendency entirely, all lower pull rods should pull in line with or below the attachment point for the lower return spring on the lower scissor. Requires a slight design change on PSGa with this type of changer, but nothing radical |
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