Thanks for the help so far!
A few pictures of the master cylinder.
The original cap was an aluminum one, with a square on top that broke when trying to get it out. The cap on there now is a homemade one from a hockey puck.
[img]https://i.imgur.com/qOUXUfV.jpg[/img]
[img]https://i.imgur.com/6hrvxTI.jpg[/img]
[img]https://i.imgur.com/VOXhUYo.jpg[/img]
[img]https://i.imgur.com/K0cmewI.jpg[/img]
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