Rudy and others have internet articles about narrowing necks without removing frets. I searched "narrowing electric guitar neck convert mandolin".
The large pad of a belt sander (hand held or table top) will be easier to handle than a circular sander or grinder. Use sandpaper suitable for cutting metal such as used for pin nailed oak floors. Go gently with multiple shallow passes. Cut some sheet metal guards protect djacent surfaces.
https://www.mandolincafe.com/forum/t...o-octave-mando
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2018 RainSong H-DR1000N2/T copper burst - carbon fibre
2016 CA Cargo black - carbon fibre
2016 Fender Telecaster thinline
2014 Fender Concert Pro (New Hartford) - red spruce, mahogany
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