Bought a Green Hornet Schwinn from Kalifornia. In shipping to the state of Misery, UPS destroyed it. After a $100 repair and straightening the fork, I am trying to install a leather covered seat with chrome springs on this old 24" girl's bike. It is made for the modern larger diameter post and of course the Hornet has the 1950s small seat post. What's the best and safest way to fix the problem? This is for my bride of 49 years and 11 months. Can't have the seat sliding down the post. Thanks in advance and Be Well, SS.