can a faulty on/off switch be repaired or replaced?

if i keep my finger on the on/off button it works! obviously I don't want to do that:)
This happened a few months ago and I removed the inside panel and got into the switch which looked very simple. I twiddled to see if anything was loose but not really. (I have NO IDEA about anything electrical but removing screws is pretty easy) However it worked when it was all put back together again even though I hadn't done anything.
I think it's running on borrowed time. What do you think?