[syntheticnature]

The 72 bytes is from the difference between the uImage header and the lzma inside, from the post. 0x132b8-0x13270 = 72 (dec).

So you'll need to check what binimage says about your image, the uImage header isn't necessarily fixed in size. Also see the comment above about the --dd switch, though mind the reply to that pointing out you might want to check what it finds before just letting it write a pile of files.