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From Bottom Line literature
1994 - Bottom Line Dominator - S4 Carbide Bars

"Unbeatable durability - two one-inch wear pads in both front and rear for a total of four wear pads."
See: Typical Wear Rod Wear patterns & Hacksaw/File Tests

"Use of wear pads instead of hard weld preserves strength of bars and helps it glide easier"
See: Bottom Line Dominator Wear Pads

"1" segments for flexibility and durability"
See: Bergstrom Skegs Warranty

From Bottom Line Web Site

"... Make it unique, make it work, test it until it fails.  Don't give up until it works ... We kept changing the formula until we got it right. ...Bottom Line Traction Products kept to a low key for the first few years."

In order to be "unique," Bottom Line ignored the entire history of carbides and chose almost every old abandoned idea and went with it.