Hey, I am new to this forum and I'm in agreement with the importance of quality and approved equipment of course. I think the problem you are having is that your require a butane or propane cartridge that has a "dip stick" inside (between the exit point of the can and near the bottom of the can). This ensures that LIQUID butane / propane is sent to the nozzle of the flame unit... If there isn't a dip stick then gas from the top of the can is sent to the nose of the flame unit and that results in the small blue ball you mention. Hope this helps and stay safe.
