2004 Skidoo Tundra Skandic Series Service Manual, Page 224Get this manual
Section 05 TRANSMISSION Subsection 02 (DRIVE BELT)
1Slide lower O-ring of tester to specified deflection2Slide upper O-ring of tester until reaching mark (zero)3Apply pressure until lower O-ring is flush with edge of rule and read force on the upper scale at top edge of O-ring1