Flat blade screw driver - insert in gap between spring ends, twist 90* and drop in place.
For removing, a good pair of needle nose pliers.
I never had much luck with snap ring pliers.
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Thanks and God bless,
Brian Carlson
Carlson Racing Engines
Vector Cutz
www.CarlsonMotorsports.com
28 years of service to the karting industry
Linden, IN
765-339-4407
bcarlson@CarlsonMotorsports.com