Most of the rubber horn bulbs can have the open end enlarged out using a rough round file.
Items 617, 618 and CA762 These have a removable rubber plug in the end under the ferrule to aid adjustment and fitting. To fit - remove brass end ferrule and push onto the horn tube, remove the end plug and push this on to the tube (easing with washing up liquid helps), then push the round bulb on to the plug, which locates into a moulded ring. Finally, pull the brass ferrule back into place over both parts of the rubber bulb and the part should fit snugly.
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