It does take some force to get them back in. Some one suggested using a credit card or something similar as a tool to push the weather stripping back into place. Even then it may not go back in exactly as originally but it will do the job. See posts above for suggestions as to how to deal with the rust problem. I have been popping out the bottom stripping after washing my car to let the water drain out and that area to dry out before reinserting the stripping.