Well, I took the plastic surgery approach.
Step 1: Remove ratchet arm from Dragonfly transducer by lubricating the glide joint and sharply tapping it backward.
Step 2: Cut the vertical struts from the Hobie plate as low as possible and set them aside.
Step 3: Remove remaining strut base. I used a cheap soldering iron to cut through this PE base and smooth it out.
Step 4: Fit transducer onto base and then position salvaged strut pieces alongside to make a tight fit which the transducer "clips" into. Either plastic weld or hot glue these in place.
Step 5: Heat gun the modified base to clean up welds and tighten up the fit.
Step 6: Invert plate with transducer in place to check fit.
Step 7: Installed in transducer well.
All Done! Fits well. I will not have it out on the water for a week or so, but will report back. My concern is that the fit may be too tight, leading to the base plate dampening the sonar ping. Hobie designed the struts to hold the Lowrance skimmer transducer 1/8" above the plate. Raymarine transducers extend far enough back that they necessarily contact the plate. I won't know if this is a real problem until I can get out and try Downvision mode.
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