There was a story, years ago, about a guy doing some plumbing. he made out his lost and went to the local hardware store ( you do remember them), and explained to the old guy what he was doing. The old guy filled a bag with all the stuff on the lust, and as he was ringing up the sale, he said, " See you in a little while". The DIYer said, "Why, did I forget something?" The old-timer said, " No, you list was quite complete, but every DIY plumbing job requires three trips to the hardware store." DIYer smiled at the old man and left.
An hour later the DIY returned to the hardware store for an additional item. The old timer just smiled, and said, " One more trip".

The DIYer did NOT return to the hardware store any more that day....the third trip was to another hardware store.
All DIY plumbing jobs require AT LEAST Three trips to the store. Its a LAW.

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1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags