Pinblocks, CA & Dope - an update

[Dean May]

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I=92ve done several of these all with excellent results. To date, I=92ve =
not found one instance where it would not work. Usually I only use =BD =
to =BE of a 2 oz bottle, using a hypo oiler to apply. This gives very =
good control. Occasionally, 2 or 3 pins may need re-treated. In one =
extreme case, I removed the pin, squirted CA glue down the hole and =
replaced the pin. Worked wonderfully. I am convinced it works by =
swelling and setting the wood, not by bonding the pin to the wood or =
filling gaps with glue. This is why it continues to work years after its =
application and multiple tunings that would otherwise destroy the joint.
=20
2 bottles of glue is way overkill from my experience, if you are using 2 =
oz bottles.=20
=20
For a very quick fix (on junk spinets that are otherwise destined for =
scrap), it is possible to apply without laying the piano down. Just =
apply to the base of the pin with the hypo oiler and it goes in. Be very =
careful not to apply too much so that it runs down the strings onto the =
damper felts. Ask me how I know.=20
=20
Dean
=20
Dean May             cell 812.239.3359
PianoRebuilders.com   812.235.5272
Terre Haute IN  47802
=20
-----Original Message-----
From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]On =
Behalf Of Farrell
Sent: Monday, March 08, 2004 9:52 AM
To: pianotech@ptg.org
Subject: Pinblocks, CA & Dope - an update
=20
FYI:
=20
I CA-treated the pinblock of an old upright six months ago. Dozens of =
pins were so loose that they immediately spun back on their own after =
raising the pitch. I tipped the piano back and applied two bottles of =
thin CA (after spending 20 minutes trying to talk the lady into dumping =
the piano). It was quite apparent that the pins had been doped some =
years ago - plate was all stained at the tuning pins and the feel of the =
few pins that had any torque was very spongy. The CA treatment seems to =
work well a couple days later when I pitch-raised and tuned the piano.
=20
I went back there last night to tune. Three pins had let go. I gave them =
a tap or two and they then had a very solid feel. All the other tuning =
pins had good to great torque and very good feel.
=20
This piano had a full plate with no tuning pin bushings.
=20
Bottom line: CA worked great on this previously doped block. Your =
results may vary.
=20
Terry Farrell

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