My first post, after an introduction, pardon any terminology gaffs.
I've seen (in the flesh) a crossbow with a short trigger mounted on the top side of the tiller, but can't seem to find any info anywhere. It appears to be a simple lever, push the pad down and the opposite end pushes the string up off its ledge(?).
Something like this, pardon the bad sketch.
Is there any historical basis for this? Any drawbacks? It seems fundamentally simple, but...