Various ways.
You can chase them legally for max payment down the line.
A 1800 $ gets to 9000$, easily.
2-3 years.
And you do not need to pay lawyers 4000$ of that.
3-4-6 meetings and letters, 1200$, recovery 7800$.
You can chase them for payment through local industry.
If they don´t pay You, the local steel merchants will close their credit lines, probably late on payments.
They either pay everyone, or close shop.
Depending, you might be able to get a lien on what you made.
Even if they sold it, it might not matter.
Liens are often enforceable against the owners of small businesses.
If You have a proper invoice, you have good standing.
Ie any invoice from an established business delivering typical product, is basically seen as valid by collections agencies and courts.
Unless Your invoice was disputed at the time, which seems not the case.
If you contact the credit agencies, with an unpaid invoice, the biz is likely to pay You immediately, for 1600$.
The credit agencies will rate insolvent a biz that wont pay invoices.
Only delay is ongoing court action.
Highly unlikely for 1600$, with culpability, no ?