The Coil is wound to Loose Dad, that will hold to much bias on the weight, tighten it up a little at a time till it's open when it starts to show some temperature. The weight should hold it open once it is warmed up and the hook on hte coil will be off it's stop a little in most cases.
That nick shouldn't hurt anything, the coil can be wound tighter or looser till you reach the correct ballance. The biggest problem with them is they rust and break off where they go thru the shaft because that is the point of highest stress.
Denny Graham
Sandwich, IL