This warranty denial has been going on for years.
Remember the fuji triple?
Back in 96' I had a XCR600. Three engine failures in 600 miles for problems with the PTO side bearing not getting enough oil or something close to that (I cant remember what the exact deal was)
Polaris replaced the engine three times, then 24 hours YES 24 hours, after my warranty expired the same thing happened. Blown motor SAME issue.
"Sorry, a warranty is a warrranty"
"Yes but it is a clear manufacturing defect, the same exact issue as the three previous engines"
"Well sir, there is nothing we can do, your warranty is expired and we will have no further dealings with you on this"
After a bit more protest, she hung up the phone on me.
I wrote the company, asked my dealer to further intervene, all to no avail.
From that point on I vowed to never own another Polaris product. That b!tch was so rude on the phone and I was out almost a $1,000.
Went to Doo and Cat from then on.
Point is this: All it takes for a company to lose lifetime business from any customer is to NOT be reasonable. They have no friggin clue what unreasonableness really costs them. Not only did they lose my business, they lost the business of my riding buddies as well. I made it clear to everyone how they would be treated when it comes time to exercise their warranties.
Every manufacturer has designed components for their sleds they really do think will be good. Every manufacturer has failed their customers when this technology does not hold up.
Be reasonable with a redesign and replacement under warranty. In cases like this where the OP lost an A-arm, replace the frigging thing!
One thing is clear, (As evidenced by forums and threads like this) bad experiences get around, people get negative impressions of a company, and they lose sales.
The snowmobile sales market is shrinking, each company is trying to get a bigger slice of pie. The ones that will make it are the ones who are REASONABLE when it comes time to actually back up their claims of a superior sled with a warranty that is actually honored.
By the way, I own a 12' M1100T and that sled has had PLENTY of issues.