Easy receipe...

1x stray pussy-cat,
3x strips of duct tape
1x garden hose (connected)
1x flat head shovel


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Re: torsion springs...
Usually a double garage door *should* have two springs. However, that does not mean that one will not work. As JP stated, if it is a very light weight metal door and well balanced, you can usually get away with one.

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"If con is the opposite of pro, is Congress the opposite of progress?"
Richard Rushing, HCRI
Duncanville, Tx.