I don't know about others,but the usual method of glueing up a scarf cut is to clamp blocks all over the place to stop it from sliding when you clamp it,you seem to end up with clamps everywhere.
what I do is lay the neck on its side on the bench,move the scarf to the desired headstock width and dry clamp it,then I drill 2 holes using a 3/32 drill each side near the nut area that will be cut away later when shaping the neck.
these holes are for a couple of toothpicks,then all you need to do is spread your glue and place the two parts together,slide the toothpicks into the holes and then clamp,no movement and perfectly aligned without a lot of clamps and messing around,hope this helps someone,regards dan
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There are a number of tricks to make this easier... I shoot 2 T-50 staples into the joint, and use a pair of nippers to cut the heads off. The result is 4 brad-points sticking up about 1/32". Add some glue and clamp... easy peasy...
Others have used a sprinkle of salt, but I could never make that work right for me...
I like the toothpick idea, though... it probably gets you perfectly aligned, where the staples require me to get it right at the first clamping... to make this easier, I lay the neck and the head on their side on my formica bench to ensure alignment. I normally leave the headstock a little proud (sticking up) and then sand the neck flat on my belt sander...
I glue up use a spring clamp to hold the sides alligned and in place. Then i put in two staples in the face and clamp up. When dry i remove the staples, plane flat and add side cheeks and a face plate.