Take some gaffer tape and mark one side with gaffer tape and leave the other side untaped. That might help. Do you know the make of the greenhouse? You might find a schematic of the greenhouse online.
p.s. permanent marker pens in several colours might also help.
Cacoethes: An irresistible urge to do something inadvisable
Sorry, I wasn't really very clear. All I meant was to put a small ring of gaffer tape around each of the struts that belong say on the left side of the greenhouse and don't put any gaffer tape on the right hand side struts. I hope that is a little clearer
Cacoethes: An irresistible urge to do something inadvisable
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