Confident fill the tank with a narrow neck to the desired level (for example, an automotive canister), if you equip the funnel with a special gauge. For its production will need a wire needle with a diameter of 1 mm, cork or foam float and a tin strip into the guide hole.
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Fine fasteners — nut, washers, jump rings — easy to store (and use them), if you sort out and strung them on pins, not forgetting of course to close the head.
