rebuilt filaments for Rigaku X-ray generators

[MENACHEM SHOHAM]

Molecular Structure Corporation has decided that sevice contracts and 
warranties on rotating anode generators and turbomolecular pumps will 
be voided if people use rebuilt filaments. They claim that rebuilt 
filaments cause damage to the system. Does anyone have independent 
evidence for damage caused by using rebuilt filaments?
The price for rebuilding a filament is about $25 whereas MSC charges 
$267 for a new one. 
 I would like to know what the crystallographic community thinks 
about that.
                                  Menachem Shoham
                         Case Western Reserve University
                                Cleveland, Ohio