Re: broken anti cavitation plate
If you are on a budget, you can "weld" it back in place with JB Weld. Although a shop will charge you less than $100 anyway, just out of curiosity I decided to repair a 6" piece that broke off my cavitation plate and several years later it was still in place with nothing but JB Weld.
Its not the "right" way, but I was impressed at the holding strength of the JB weld.