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Golfing pros at this week's U.S. Open out at Bethpage, N.Y. need their equipment to be in top condition.

If during the practices leading up to the actual tournament they feel something just doesn't feel right with a club - from a broken shaft to a putter that's just a gram too heavy to razor-thin tape not being in the exact right spot underneath the grip - they come to a set of high-tech trailers parked just off the driving range for new clubs.

The trailers are like mobile factories, and the craftsmen can build new clubs to precise pro specifications in minutes.

"We spend Monday, Tuesday and Wednesday of every tournament week at the site repairing, building, modifying, doing anything we can to enhance the equipment the players use every week on the PGA Tour," says Barry Lyda of Callaway Golf. "For instance, this week with very wet conditions and a very long golf course, a lot of high rough, a lot of guys are asking for higher-lofted drivers to carry the ball further because it's wet and soft.

"It doesn't take very long. We have five-minute drying epoxy," continues Lyda. "So they can literally prep a shaft, put a head together, get it glued in about 15 minutes."

Some pros can show up and within one hour have an entirely new set of clubs made, and not necessarily because they are being picky. Just recently, pro golfer Matt Bettencourt walked into the TaylorMade trailer asking for an exact clone of his set out of sheer necessity.

"Two weeks ago at the Byron Nelson Championship I had my clubs stolen on Wednesday, the day before the tournament started," says Bettencourt. "So I just showed up here Wednesday morning without equipment and they built me up a complete new set of golf clubs. And the clubs are great that they built for me."

Staff at the trailers are usually on call 24-7 through Wednesday, then are out of town by the first tee off Thursday, since players cannot alter their equipment once the tournament begins.