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@hoonz
I used a piece of copper pipe to shim my stem once as I was desperate to get the bike on the road and needed a shim when all the shops were shut. Worked ok for about 2 days then began to slip. I do not recommend this as copper is very malleable and squashes. I ordered a proper Ali shim and it works a treat. I've even shimmed a quill on a beater with a piece of steel food can. Was rock solid.