David wrote:

Carter makes an excellent guide for 1/8" blades but it's about $60. I
was going to buy one but can't bring myself to spend that much for a
little bit of aluminum, a bearing and a couple of screws.

Perhaps that's the wrong way to look at it. Might be better to consider
that your $60 is buying you the capability to use 1/8" blades. That way
you're focussing on your goal and can decide its worth rather than the
ingenuity of how it's to be implemented. Is it worth $60 to be able to use
1/8" blades, regardless of other considerations?

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Cheers,
Rob