Hey,
I also got problems with the b44.1 spur getting damaged to quick.
I had the b44 last year, and didnt have the same problem.
Found a good reason for this:
As you can see, the new b44.1 chassi has a closed spur-"track"
On the b44 chassis it's open.
On my b44.1 i've already broken 4-5 spurs when small rocks etc has gotten stuck between the spur and the chassis.
I'm going to dremel the chassis, so it's open. The undertray wil keep rocks out, and flex if rocks passes through..