Charley, "skint" makes good sense, but "thin" seems to come through the low-fi and bad scratches. Wright sings this line three times, first as the second half of the couplet, then (twice) as a "couplet" of its own.

But what the heck? It's the 21st century folk process! In fact, I like your version better than the original--whatever the original is!

Hopefully the Carpenter Project folks have better sound equipment than I do.