A pragmatic view of cartridge expenses / many questions

As the van den Hul for 5 years and the current Phasemation US agent, I would like to share what I know to be true.
i have recommended that normal life of a stylus 1500 to 2000 hours or use assuming that it set up properly.(anti-skate and azimuth and SRA)
van den Hul recommend tracking weight at 1.35-1.5 gram you should get another 500 to 1000 hours 
The suspension is made out of elastic materials Just like there is no NOS rubber tire suspension elasticity changes over 
If you treat your cartridge properly you should replace the suspension when you replace your worn out stylus. If you have an old cartridge with low hours if it 10years old replace the suspension The rubber get hard and brittle
I hope that helps

I am in agreement that there are going to be Cartridge Brands that might prove to have a requirement for a part that is only obtainable through the Manufacturer, or a Second Donor Cartridge.
My experience was as sure footed as one could want.
The Technician is known for their Workmanship and
their Freelance History of working on the Cartridge Designs for a Cartridge Producing Company.

No work is to undetaken until a suitability check is carried out through a a pre' rebuild Inspection.
There is a chance the the Technician carrying out the Inspection may have to report back that a certain part is in a condition that is unusable and the rebuild will not work to the level of the required Specification.
( I know this is a possibility, as I know of Cartridge Owners who have been supplied this information) 
This Service when used myself, does not produce a Cartridge that will Play Music after a Service like some known Services, which in cases proves to be a lesser quality than the Manufacturers Original Product,
but has a sound quality that is perceived as improved over the poor condition Donor Cartridge that received a treatment.

The rebuild Service used by myself, is a Rebuild Service that will supply a Cartridge in its Original Build Spec, but having undergone extensive Quality Control Measures, from microscopic intensive cleaning, through to replacing the Parts with Manufacturers Parts, followed up by multiple hours of measurements and adjustment, to ensure the Cartridges Specification is exact.

Or in my case, the Rebuild Cartridge is Producing a Cartridge that has the original Generator Coils retained, with a complete exchange of Parts
that are used on much more High End/Exotic Models,
each configuration being chosen, is selected with the Technicians understanding through discussion with the Cartridge Owner preference for the Cartridge Presentation.
The Cartridge will undergo a Microscopic intensive cleaning, along with the  Rebuild, and on completion will put through multiple hours of measurements and adjustment.

I have become a fan of this Technicians work, and after having investigated as much of his Rebuilds as possible through Web Searches can only say he has many supporters.

To help the OP with their investigations, I have sent a PM to show them the contact for the Rebuild Service and assess the supplied information for accuracy.  

      

Cartridges depreciate more quickly than just abt any other component or part (used tubes?).   This also presents opportunity.   There are a lot of high end cartridges floating around the market at prices that are a fraction of original purchase costs.  Some cartridge manufacturers offer rebuild services, but at extreme cost.    There are several independent cartridge rebuilders who have well earned reputations for excellent workmanship and quality.  And charge much less than manufacturers.   It becomes very cost effective to purchase a used cartridge then commission a rebuild from one of the independents.   Total investment is generally 33%-60% of the cost of a new model.    Just something to think about.  

I find something almost Zen about tangential tracking tone arms, playing back the record the way it was cut. But there are several reasons I would not do it. First is the need for near frictionless air bearings, the noise of an air pump and air hissing through the holes, and the added maintenance requirements. Second is a difference in tracking angle makes the music from one side of the groove offset by a millisecond or fraction thereof, equal to sitting an inch or two from the center of the sweet spot equal distance from the speakers, Third is the cost of five figures for something I do not believe I would hear even if I concentrated very hard trying to hear it. In the case of a very expensive cartridge I think I would experience a point of diminishing returns long before $7000, complete with its limited life span. There have to be greater differences in concert hall acoustics and orchestras than there are in a cartridge costing hundreds to a thousand dollars vs ten thousand dollars.Years ago I made the mistake of buying the ultimate cassette recorder by Nacamichi, (if I even remember how to spell it) and in it played beautifully when it was new. A year later it was worn out and a few years later it was obsolete.

drbarney, that was a jump from rebuilding cartridges. But hey. Does not matter how frictionless you get a linear tracking arm. The large horizontal mass plays havoc with even the stiffest cartridges not to mention getting them perfectly level is next to impossible. But there is a way to do it. Check out the Reed 5T and the Schroder Lt. No compressors required!
Back to Cartridges. If you can find a good cartridge with low hours from someone you trust go for it. Otherwise I personally will only by a new unused cartridge. I have never rebuilt a cartridge because there is always something else I want to try. Like I said, from a rebuilder you never quite know what you are going to get.