Higher Quality Than My Original.
I purchased a second-hand, but unused LSZ-1 from the estate of a retired gentleman who passed away before he could use his machine. After 10 feet of sewing two layers of thin vinyl, the feed dog snapped in two pieces. I contacted Sailrite to inquire if there was the possibility of user error or machine malfunction before ordering the replacement part. Sailrite offered to send the part under warranty, even though I was not the original owner of the machine. That was outstanding customer service, I fully expected to purchase the part. Thank you Sailrite.
The new feed dog is much nicer quality than the original part on my machine (2015-2016 model). The casting is finer quality and the machining is cleaner and more precise. The horizontal webs that connect the serrated feed feet are much beefier, in fact the whole part is about 10% heavier by weight than my original part (I used a jeweler's scale to weigh them).
If you broke the feed dog on your LSZ-1 and are looking for a replacement, this will get you going and it might just be better than your original.