How do I fix a seat that keeps loosening and wiggles back and forth. Tightening the underneath bolt does not help.

You might want to add some rubber washers to the bottom where you tighten the nuts You can also ask the vendor, I had some questions and they respond very quickly. I bought 2 and no problems like you are having. I was have issues with the seat wanting to go down after you put the toilet seat up. They told me how to fix it.

What are thing hinges made of for the "soft close" (non zinc-alloy) seats? Which type of hinge should I get?

This thing is to heavy for any soft close latches…you may not even be strong enough to lift the seat up at all..

Are the hinges adjustable?

No, but they exactly fit my bowl, 5 1/2" for the bolt width and 18 1/2" from bolt line to front of bowl. It was very easy to install and has worked GREAT!

Color	Natural
Brand	Angol Shiold
Material	Wood
Style	American,Elongated
Shape	Elongated
Product Dimensions	18.4"L x 14.3"W
Item Weight	7.7 Pounds
Operation Mode	Manual
UPC	653871439303
Manufacturer	Angol Shiold
Part Number	MD197-RL-FP306
Item Weight	7.66 pounds
Country of Origin	China
Item model number	MD197-RL-FP306
Size	Soft Close
Batteries Included?	No
Batteries Required?	No

Elongated Toilet Seat Molded Wood Toilet Seat with Quietly Close and Quick Release Hinges, Easy to Install also Easy to Clean by Angol Shiold (Elongated, Natural)

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