Putting a new seal in a track pump

[bonker]

My Specialized Air Tool broke recently ( the main seal was all mangled) and I'm planning to fix it. Any tips on getting the new seal in without breaking it?

 

[Spiderweb]

You can buy rebuild kits, I’m guessing they would come with instructions;
https://www.jejamescycles.com/produ...mp-floor-pump-pre-2010-hp-rebuild-kit/option/

 

[bonker]

No instructions came with the part.