Car - 82 240D w123

So this was the first time I have ever had to change out shock absorbers on a car. Much easier than expected.

However, when trying to attach the top (behind the rear seat), the nut would only go so far down before it would not go on any more. Thought that must be how it was supposed to be, put in the seat, and enjoyed the comfort of the new shocks (blisten comfort rides)

I came into work, and one of the guys here said the nut should go down, and it is hard to get it to twist down because the piston moves as you turn. So basically I had two questions -

I dont have a weekend for a few weeks, is it ok to leave it as is (nuts loose on the top attachment of the absorber) ?

Second, how do I get it to tighten down with standard tools?

Thanks!