Quote Originally Posted by seb5 View Post
That's kinds cool. However, I've put on dozens over the years and was always able to get them right. Sometimes I'd just seat it a bit off center and when I torqued it it pulled it straight. YMMV. Now they have tools for every detail and I've bought many, this I'll pass on.
I've got one of those, it's a knock off of this one:

https://geissele.com/reaction-block-...tube-only.html

I find it useful for a lot of tasks, torquing the castle nut hasn't been one of them.