The plastic thing is pretty clever. Maybe some adaptation could be used for Fender style mounting too. I like Smoke's idea with the tape too. I have similar problems with the drill not fitting inside the cab. I thought about buying a 90 degree drill just for that purpose.M Fowler wrote: On my Dumbles I used clear plastic cut to chassis size, hole position marked, drilled and then used as a drill guide for the cabinet.
Fender slant style can be a little tricky.
Chassis mounting
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