Note the high dollar Dennis Kirk spring tool in my post above is designed to be able to "Push" an exhaust spring on. That is for applications on snowmobiles where the spring location makes it impossible to be "Pulled" on. In that same catalog you will see a T handle spring puller that is much less expensive. The T handle should work well on the toughest of springs on our little airplanes.
https://www.denniskirk.com/slp/sprin....prd/28705.sku