Agree if you already know how to do this. We've been welding rubber and plastic together for 40 years. Most folks don't seem to get it though. I can't imagine why. Heavy anti-freeze bottles work well, as does a great many plastics. Bert, if you go by construction sites, you'll find exterior door threshold protection covers that are removed once the construction is completed. That stuff is some kind of excellent for welding and making flat friction reducing washers, etc.
Between the three instructions, he should be able to secure it for a day or two. lol
I took years to pluck up the courage to try welding and when I did, it was easier than patching with wire, riviting plates or epoxies.
Started doing it with bumpers on the vans, the drivers were forever ripping them off, which is quite a feat as they are inboard of the crash bars & tow bars.
Done at least a dozen JD 100 series fuel tanks and none have come back.
Bought a cheapie attachment for my hot air gun that fans out the air for paint scraping and after that there was no stopping.
Dirt easy and dirt cheap.
Lots of U-Tube videos but just be ware of the idiots who tell you to use a particular item ( Every body seems to think nylon cable tie ends are the bees knees, they are not ) for everything.
Most plastic on a mower is HDPE although I have found some hoods made from PET.
HDPE is most food containers , milk bottles , fruit jars and PET is coke bottles.