I have had one for years, but I have an issue with it. When chopping shapes and "I" beams the blade flexes and produces an angular cut. Has anyone had this issue and if so have they been successful in modifying the blade so as not to make angular cuts and keep it cutting square. Comments and solutions welcome.

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Over in the Scratchbuilder forum I posted some photos of my "Chopper" that shows the small mod that will cure your problem :
Chopper
HTH

So, the idea is to slightly angle the blade. I once made a new handle for mine with an offset, so I would keep mashing my finger under the handle. I'll have to revisit this and add new holes and the milled area. Kudos on such a simple and elegant modification. Thank you very much.