Hayward Sand filter replacement handle stripped threads

I just replaced by so Hayward sand filter vari flow XL handle this weekend. It looks pretty straightforward, six bolts out six bolts back in. first go around I forgot the O-ring so it sprayed water like a fountain. Once I get that on it worked what appeared to be fine. Later in the day it appeared one of the bolts had backed out some so it was spraying water out that side of the seam. I tried to tighten the bolt down but it appeared to be stripped in the housing below it so it just spun and did not pull it tight. Any suggestions on how to fix stripped threads in the plastic housing that the handle sits in?