Last time I shot this gun, it acted finicky. Took it to the gunsmith and he said it was the mainspring which he changed out. Flash forward a few years and I took it out now and the safety on the right side since it has daul safeties just came off. I know there is a slot on it to secure it to the other side. Should I partake in assembling it ? Can't seem to locate a gunsmith with the current crisis going on.

It isn't hard, unless you typically break things.

I would replace the entire thing.  Watch a youtube video to learn how it needs to be fitted.

I prefer the Ed Brown style.

Got it !