Hi, I haven't made a lot of ELBs, but I tend cut some temporary nocks in the tips for use in tillering. Then I glue on the tips and make final adjustments to the tiller. I've read that that sequence was widely used in the past. One of the main reasons is that a bow that is slightly under weight once the proper tiller is achieved, can be shortened to raise draw weight, without ruining all the work of the fancy horn nocks. I'd like to say I'm such a stellar bowyer that my bows always come out right the first time, but I'd be lying. The temporary nocks tend to be obliterated when the ends are shaped to fit into the horn tips.
Ron