Have you tried to contact Banggood to see what they have to say about the short wire and where to connect it?
SMF - Just Installed!
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No, I don't have time to write my own, and since my goal is to have a good interface for the engraving, with resize, preview, laser power selection etc., probably it's beyond my skills.
I found the same as you did. When focussed it punched a dot about the size of the head of a pin in the wooden baseboard......
Someone said the 5.5 watt beam was top hat shaped when it was focussed... more a block with a wider kerf. I found I could get it to a very small spot. Not cut anything so cannot say how big a kerf it makes......
It certainly needs something to use to focus better than twiddling the lens ring with fingers as it is a bit awkward in my estimation to focus with accuracy and ease ...being so close to the mount.