Drilling plate

[John Ross]

I install my carriage bolts, head to the back. The squared off part, 
digs into the wood, and stops the bolt from rotating.
I find that they stay tight, and the wood doesn't seem to compress any 
more, after the first compression.
I have done quite a few over the years, with no problems.
John M. Ross
Windsor, Nova Scotia, Canada.
jrpiano at win.eastlink.ca
----- Original Message ----- 
From: "Michael Spalding" <spalding48 at earthlink.net>
To: "Pianotech List" <pianotech at ptg.org>
Sent: Friday, August 25, 2006 10:04 AM
Subject: RE: Drilling plate


> And in most consoles the tuning pins are packed in so tightly around 
> the
> existing holes that you have to grind off half the head of a carriage 
> bolt
> to make it fit.  I use 5/16 stove bolts (flat head, slotted, 
> countersunk),
> available  in boxes of 100 from boltdepot.com .
>
> Mike
>
>
>> [Original Message]
>> From: Bob Hull <hullfam5 at yahoo.com>
>> To: <pianotech at ptg.org>
>> Date: 8/24/2006 10:08:43 PM
>> Subject: RE: Drilling plate
>>
> There are
>> pianos whose tuning pin field will not permit bolts,
>> so using existing screw holes would be the method for
>> that scenario.
>>
>>
>> Bob Hull
>>
>
>
>