besides a gaggle of other brand/model transducers, i've installed upwards of about 90 K&K transducers for guitars, mandos, ukes, dobros, violins, cellos, even a few kanons, whatever. unlike the mando, these all went in with viscous CYA (hot stuff or 3m) only and no tape. i deferred to dieter's knowledge and made sure to use a double layer of his tape on each mando transducer, followed by a dab of thick 3m CYA. you don't want to use a lot of pressure either, and just allow the glue to gap fill any minimal soundboard curvature.
the instrument wood must be prepped prior to any transducer gluing or taping or taping/gluing. this includes cleaning the area with naphtha (lighter fluid). on some soundboards or bridge blocks the wood is a bit rough and requires sanding smooth before cleaning with naptha.
while most mandos sound quite good with the K&K unit, i fitted my personal breedlove quartz with an lr baggs radius, just using the putty goop. works and sounds just fine for me.
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