I borrowed my son's bike (a simple mountain bike) and I have problems with the saddle: I pushed it as far as possible to the back (so that it tilts down as much as possible otherwise I have the feeling of riding on the back wheel) but it does not want to stay put.
After a few kilometers on a good road, it starts to wiggle and I have to stop to tighten the screw. Right now I tightened it almost as much as I could but I am afraid to break it by going too far.
Question 1: is there a better way to fix that saddle?
Question 2: I am considering buying a new one - is there something that I can improve (from the perspective of the stability of the fixing)