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!

Manufacturer	Angol Shiold
Part number	MD197-RL-FP306
Item Weight	3.47 Kilograms
Product Dimensions	46.74 x 36.32 x 5.33 cm; 3.47 kg
Item model number	MD197-RL-FP306
Size	Soft Close
Color	Natural
Style	American,Elongated
Material	Wood
Shape	Oval
Batteries Included?	No
Batteries Required?	No

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

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