one of the blessings of owning a house built in 1890 Manny is I do have an unlimited supply basically of lumber that owners have used for odd jobs and squirreled away the extra into the garage, I have to say I like your idea (cost/simplicity) and I might just make them tonight when I get home. I know I have 2x12's kicking around, as for the string, I have one hanging in my garage already, always know when there'll be enough room to close the door that way... drive till this hits your windshield type thing.

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2002suzukiGSF600S
1985 190e 2.3