What about slingshots and bow eyes? How to protect the arch of the foot?

How to prolong the service life of rubber band. \x0d\ 1 Buy a rubber band, pour half a bottle of oil, spread it evenly and seal it for 3 days. \x0d\2 Before each exercise, put some oil on the bow, make 80 or 90 rounds, and then put some oil on it. Stop every few rounds 10 to slow down the rubber band, so that the rubber band will not exert force in advance. \x0d\4 The arch with a thickness of 7MM or 8MM is the least wear-resistant \x0d\5 Stone-washed arch eye. For your problem, you can buy a rubber grinder with a revolver, borrow an electric drill to polish the arch eye, and then polish it with 1000 wrist sandpaper. These are all on Taobao.