Maybe Slaters in house Guns in Tennessee as he does work on 87's. I don't know why anyone would weaken an 87 main spring there is no resistance from the spring when you open the lever. I have 2 87's one is an IAC the other is a Chiappa, both have the drop 2 and run fine. If you cannot find the Phone # for Slaters let me know and I will give it to you after I find it.
wM1