Burger and Gareth Bull are two more top makers who use proprietary pivots.
Trevor Burger is so nice, he promised to send me a pivot tool for my new flipper.
Gazza at Gareth Bull can be so uncommunicative that you couldn't count on him selling you a tool much less giving you one to adjust the custom knife you just bought.
I had a pivot and screws fall out of a brand new Strider. When I complained that Strider requires a $25 fee to return any knife for service, the company promised to send me a tool for free.
Weeks went by and no tool.
When I inquired again, Strider said they didn't have any such tools, even to sell.
Some manufacturers provide tools with their knives that use proprietary pivots. Boker includes such a tool with its excellent, Chinese-made, Boker Plus Exskelibur Decade series.
But the tool doesn't fit the Decade series Exskeliburs. When the folder is off-center out of the box, you have to make your own tool to fix it. Boker USA has been non-responsive to complaints by phone and in writing on this forum.
I pretty much hate proprietary pivots and dialing for dollars with makers who may or not provide a tool to help you adjust your new knife.
It would be just fine with me if all folders used flat-head screw drivers to adjust their pivots, like Ernie Emerson's knifes.