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Re: Replacement for Vito 7212

Author: Gordon (NZ)
Date: 2003-04-04 11:58

Tenons break easily. Tenon sockets, much less common.
If this break was below the socket, in an area that is actually structurally stronger than the tenon or socket, then there could be other reasons.

A post could be inserted too tightly, such that when the plastic shrank in cold weather it was under great stress. This is one of the benefits in screwed-in posts as used in Yamaha plastic instruments.

I encountered a batch of Accord clarinets that all cracked at the thumb tone hole insert, presumably for this reason.

Another cause can be the use of inappropriate solvents. These can leave the surface visibly intact but break down the molecular structure of the particular plastic, deep into the plastic, making it far more brittle. Even alcohol can do this with some plastics.

Perhaps a technician once cleaned the instrument with a solvent.
Perhaps the glue that was used involved such a solvent, preparing the plastic for a second break.

I can assure you there are no problems with a pinning method if all details are carried out appropriately. But I an understand the reticence of the average technician.

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