[Unclenick]

Leave your original mainspring alone, if it is working. I recommended the Numrich replacement because it is, as Bowhunter implies, likely to be a part of low enough intrinsic value that you don't lose a lot if you ruin it. Indeed, it may well be both enough worn and have taken enough of a set that it lowers your DA pull just as it is? If not, whittling and grinding it won't put you at risk of a great loss, where whittling and grinding your working original could leave you with a disabled gun should none of the Numrich parts work out.