Hi It is a blind collector, if you cut and weld the same piece on the floor there is no problem, yes: BEFORE you cover it, try well that there are no losses, if you can weld it with silver (it is more robust) but with tin it is fine, before cover paint with asphalt and cover with corrugated paper. It shows a good work done by people from before, if you follow these rules of art you will not have problems in the future Regards !!