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If you want sprinkler heads that can be dismantled down to the smallest piece, you need to get in your time machine and go back to 1970. Today's plastic gear-drive sprinklers do not "come apart" on account of they are ultrasonically welded together. You cannot undo ultrasonic welding.Yea, I knew that the first response was going to be "buy new". But like I said, they're not cheap here in Canada, and there are simply too many of these things that I need to replace.
I'm going to cut one open with a band saw and see how exactly these things work on the inside and how they are assembled so I can take them apart.
Replacing them at $25 each is crazy when they are almost fully functional.
Shipping stuff to Canada sucks, because by the time you add customs/duty/GST/brokerage charges, you end up paying about what it costs here at retail. That's why Canadians who are close enough to the US border either drive across and buy the stuff at Home Despot or take out PO boxes and have stuff shipped to the US PO-box.The PGP's are on sale right now.
Actually, there's more stealing of copper and metal stuff in the US than in Canada. Stuff like air conditioners and even street and highway lights. Home lawn irrigation is not common in the South-Western-Ontario city where I live. More common for commercial properties.There must be a lot of crime in Canada. If stuff's so expensive, people must be stealing their neighbors PGP's.