OO fun I made a lot of these. Let's see... I thought a nice, straight, dense piece of pine would make a good bow. Tiller looked good, but it took 5" of set.
I also used some mystery wood for nock overlays. It ended up being too soft and the string (made of mystery cord I found in the garage) cut right through it.
I once tried to raise the weight of a perfectly functioning red oak board bow (That's right, fully shot in, 35# bow with 1" of set, and I thought it wasn't broke so I should mess with it) by backing it with a thick strip of hickory, which promptly killed it.
Once I was working on another red oak bow and the tiller wasn't balancing. One limb was far stiffer, so I got impatient and removed a crapload of wood. It was immediately unbalanced in the other direction, and only pulling 25# @ 30". I balanced the tiller out (to like 20# @ 30") and gave it to a friend of mine with kids. It's so over built for the draw weight they'll never break the thing. I think it ended up taking 1/4" of set.
That was only in the first 3 bows! If mistakes are for learning, then I learned a ton from those 3 failures. It's no wonder why I made half a dozen good bows after that before another failure! I think that was a lesson in preparing glue joints properly. More specifically, what happens when I DON"T do it properly...
The most recent mistake was me messing with a functioning bow again (didn't learn my lesson). I took the first and only penobscot bow I've made to date and replaced the artificial sinew back strings with dacron. No stretch in dacron, and it chrysaled to death shortly thereafter. D'oh.
Which one is best? You decide. The last one just goes to prove I'm still making a rookie mistake now and then. What is the cut off for deciding when something is a rookie mistake and when something is a stupid, should have known better mistake?