The garmin original spring bar was much easier to remove than expected, I got it done by an old paper cutter, in less than 5 minutes.
then I installed a rubber band with a pair of ordinary spring bars, 2mm diameter and 22mm length.
below picture shows a comparison among garmin spring bars and the ordinary ones. on the right side are the pair of 2mm diameter spring bars, on the left side are the pair of 1.8mm diameter ones i was using yesterday. I actually removed the garmin spring bars in yesterday and install another silicone band. But the rubber band which i m currently using is seems way better. I am very happy that since then I could try a lot of different watch band with my Fenix 7.