Aluminum is very easy to melt, this is how I cast myself some real nice and custom sized aluminum bars for an upcoming project.
With very little effort I can have a perfectly sized aluminum bar for any steel tubing. After letting to cool for a good while the release process is not that hard, and with just a little sanding you have a great slide action between aluminum bar and steel tubing, perfect to make any kind of interchangeable arm you need!

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