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The Wayback Machine - https://web.archive.org/web/20070616002423/http://www.buzzardbass.com:80/Modulus/Modulus.htm

Modulus and the Buzzard Bass

A few years after John Entwistle's initial collaboration with Warwick Basses to design the original Buzzard bass, John further progressed the design of the guitar by implementing graphite to the neck to give the neck the stability that he was looking for.  With the help of Modulus Guitars assisting John, they designed the next version of Warwick Buzzards with graphite necks.  Modulus provided Warwick their graphite necks for 6 Warwick basses of John's personal collection.  There were, however, very few solid graphite Buzzards made by Modulus.  It has been said by various sources that Modulus made 10 productions of their version of the solid graphite Buzzard and stopped.  The reason why they only produced 10 of them is not completely clear to me at the moment.  It is however a fact that John paid full price to Modulus for 2 of the solid graphite Modular Buzzards for his personal collection.

HERE and HERE is another version of the Modulus Buzzard.  The current owner of this Buzzard, appearing in both pictures, says that this particular bass does not have a serial number and it is autographed by John himself.