'tis an aluminium can, what else are they made of these days?
& why is it important?
Some cans are still made of steel (easily spotted, because they stick to magnets, aluminium does not - learned that from Blue Peter when I was about ten).
The reason you need to use aluminium rather than steel for a shim is that, over time, steel compresses and aluminium does not.
Some cans are still made of steel (easily spotted, because they stick to magnets, aluminium does not - learned that from Blue Peter when I was about ten).
The reason you need to use aluminium rather than steel for a shim is that, over time, steel compresses and aluminium does not.
Shim + compression = eventual 'ouch' moment.