Accu-Cauls
Accu-Cauls
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For professional results, use Accu-Cauls, the finest key cauls manufactured. Finely machined from solid brass, guaranteed accurate to plus or minus .0005". Front rail cauls are manufactured from 3/8" stock, while balance rail cauls are manufactured from 11/32" stock to allow insertion into all balance rail mortises.
Solid brass offers the advantage of precision fit, and can be heated for sizing, if necessary. Easy clean-up.
The purpose of the key caul is to size the bushing cloth to slightly larger than the key pin. Use a micrometer to measure the pin diameter. We suggest using an Accu-Caul approximately .004" to .005" larger than your front rail pin, and about .002" larger than the balance rail pin. Doing so should provide key bushings that require minimal or no easing.
Shipping & Returns
Shipping & Returns
Delivery charges may vary from one shipment to another.
We will confirm these fees with you before proceeding with the payment.
Please note that our business hours are (Eastern Time):
Mon-Thu: 8h00-17h00
Fri: 8h00-16h30
Thank you
Pianos Bolduc, manufacturer of fine piano components, maker of specialized tools, and major piano re-builder distributes parts and supplies for piano technicians and rebuilders around the world. This catalogue has been specially designed to serve piano technicians, re-builders, and manufacturers. For technical advice, please do not hesitate to contact us by e-mail (info@pianosbolduc.com).