I removed the clutch and brake master cylinders a while ago and had the same issues getting the clevis pins out as already mentioned numerous times by others. One of the pins had decided to "weld" itself to the push-rod so took a lot of penetrating oil and persuasion to extract. This was not surprising as the car last turned a wheel in anger 28 years ago.

Once the master cylinders were unbolted I found in the cubby hole the felt mat that BMC installed to soak up any fluid drips from the master cylinders (part HYB1319), plus a well-worn old clevis pin that had obviously been hiding there since removed by the previous owner many decades ago.

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

Nice find. I am still learning new things about these cars.

I didn't like what I found, so I left it out on-rebuild.

A dead mouse??

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ex-NSW Police 1970 MK II Cooper S
VMCI #43

Rust?!!

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1963 Morris 850 Smoke Grey
1963 Morris 850 Shadow Blue
1965 Morris Mini Smooth Van
1966 Morris Mini Van
1969 Morris Mini Deluxe Resto
5/72 Clubman Gt

I'd say that came some time after the hessian piece was soaked in brake fluid for an extended period of time before the owner worked out where the fluid was going to

That clevis pin has certainly been flogged out Doug .