i have had the same problem tonight! the s n s capsule just rests on the silver bar, then you clip the strap over the capsule. whereas the peg p or maxi cosi capsules seem to clip in and you dont use the bar. apparently the pram is best fitted for maxi cosi capsules. wish i knew that beforehand! it is supposed to be perfectly safe, but it does seem a little unstable to me.....will see how it is when there is a bubba in it i suppose