Here we have an Ibanez RD 300 bass guitar,an inexpensive road warrior that belongs to a gigging musician. One tuner is broken and it's started to crack near the tuners at the headstock. This will be pretty basic,the only slight problem is how to apply clamping pressure on the oddly shaped headstock. Taking a bit of scrap plywood,I trace around the headstock,then it's over to the band saw. In no time we've got a custom clamping caul. There are a couple of good glues to use here;I chose super glue for it's wicking capabilities. I'll keep some acetone handy for quick clean up if necessary. A few Irwin Quick-Grip clamps and we're in business. After the glue dried, I drilled out the tuner screw holes and doweled them to prevent the screw from pushing the crack open again in the future. The tuners cover the dowels and look completely stock from the outside. That's a really clean result for such a "quick and dirty" repair!