Hi shetwps
Not sure I followed, I think I might take your offer of the pic
As you say, there might be some extra space of movement under the right side of the space bar, which is making that clicking noise. If there is a space it must be right under the key.
What I am confused with is that the battery compartment is few millimiters away from the back plate where the key is, and there is no direct access to the back of the key from there...
Did yours have a similar issue?