Bass bridge puzzler

[Mike Kurta]

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    Hi Gang:
    Two weeks ago, I duplicated a bridge for a local tech from a 10 year =
old Baldwin console which had split in the usual manner.  After =
installation and attempting to pull the bass strings up to pitch, the =
new bridge split again down the pin line on the speaking length side of =
the bridge.  Will now have to make another, but don't want to have the =
same result. =20
    A few points:  Hard rock maple was used, the dimensions, pin size =
and positioning were all closely duplicated, and finished with DAG along =
the top.  Grain orientation was followed according to PTG information.  =
The new bridge failed the same way as the original one.  We did not =
measure downbearing, felt there was no need. =20
    We are looking at some possibilities:  1.  I used the entire length =
of the new pin into the wood, did it weaken the bridge along its length? =
 Did the pins drive in too tightly starting the split?   Was there a =
flaw in the wood?  I havn't seen it yet, so will examine.  Should I use =
smaller diameter pins next time?  Should they be angled more toward the =
center (each other) at the bottom of the bridge?  Was there a design =
flaw in the original bridge we are repeating? =20
    Any ideas?  HELP ! =20
    Mike Kurta

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