Most of the "good" folders require new trunions and extensive work. You can get a Tapco side folder, but the majority of people here feel that they are garbage. Too flimsy, wobbly and "cheap." The triangle patterns you're talking about require extensive work. You can get an ACE folder, but it isn't cheap--in either quality or price. One nice thing about the ACE is that it's US made, so it helps with compliance, and I've never heard any bad reviews about them.