What do you mean when you blew the primary? I assume it was the stock TRA and something broke inside the clutch, like an arm? There are dozens of posts regarding the stock clutch and known issues but please be more specific if you are looking for some assistance and a resolution to your problem. If it is the clutch and it needs replacing then you have a couple of choices and you can do the research on this site and see what others have done.
Change the primary, if you still have a TRA on there you will have to rebuild it often. It works great when newly rebuilt though.
TRA replaced at 3000 miles (Shot full rebuild would be needed) -> Edrive 2
Edrive 2 replace at 2800 miles (Flat spots on rollers) -> Calibrated Gen 1 PB80
PB80 Still strong at 14000 miles (could have replaced the spring, but only lost 300RPM so I added a bit of weight)
Don't know how long a CVtech clutch would last, but the way I rode it I'm impressed. Sold it with the sled.
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