Has anyone ever observed it documented the flame hardening on WWII slides was finished to prevent cracking? Some Military document that particularly says hardening is to avoid cracking. Ensure that there is enough top clearance without tree branches or wires hanging. You may go for a fundamental bouncer or Opt https://www.zeemaps.com/map/klwcg?group=5253280&location=Santa%20Fe%20Springs%2C%20CA%2C%20USA