A competent repair shop is your safest bet.
Do you remember what if anything was the last sort of lubricant you
put on the tuning slide? Some people use vaseline [as I do] but that
can lock up your slides if they are tight to begin with.
Tow truck, large tree, chain.
Place the horn in the fridge for an hour (or freezer for 15 min.).
Meanwhile boil a small cloth bag filled with sand. Apply the bag
to the sides of the slide. Have a friend loop a cloth through the
slide and pull while you're doing this.
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