It's worth repairing if you do it yourself,but if you have it done at a gun shop the cost will likely approach that of a cheap new springer!
If you decide to do it yourself there will be plenty of help offered from myself and from others on here I'm sure.The model of Airsporter you have can be determined from its serial number or if you post a pic on here we can identify it for you.
Here is a link to parts diagrams of the different Marks of Airsporter.
https://www.gunspares.co.uk/categori...87/Airsporter/