For pumping nipple balls often use Bicycle pump with a special needle. But it does not matter if it broke or its just not there at hand: with this work well covered by a normal Bicycle nipple off a rubber tube mounted with its threaded shank in the hole of the pump.
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Do not rush to dispose of used aerosol cans. They still serve. In the case that a hole is drilled Ø 8 mm, which are sealed cropped fitting nipple from Bicycle inner tube. Through it is...
