Bottom-mounting edge guide for Craftsman 500 router


I recently "inherited" a Craftsman 500 router shortly after my nearly 30-year-old Craftsman router became unusable. I went to Sears and purchased a "guide kit" for the 500 but to my great surprise discovered that there was no micro-adjust of any kind on the edge guide that comes with that kit. One would have to "tap" the guide to the desired position making it virtually useless for mortising and tenoning.
The 500 has no holes in the base for a standard edge guide with two slide rods that fasten into the base a half inch or so from the bottom. The only way to fasten an edge guide to the 500 is by removing the plastic sub-base and screwing the edge-guide to the bottom of the base in place of the normal sub-base.
Is there any edge guide that mounts to the bottom of a router in this way and also provides some form of continuous adjustment?
Thanks in advance for any help!
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snipped-for-privacy@uwo.ca wrote:

Think it's time to modify the one you have, perhaps. Never seen it so can't really visualize it, but perhaps there's a way to drill and tap a location for a threaded rod...
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