Support BladeForums! Paid memberships don't see ads! Thanks! A pressed stop pin is semi- permanently pressed in a hole that is usually .001"-.002" undersized. Generally one side is undersized and the other frame side stop pin hole is .001" over for a slip fit. A floating pin "floats" in a hole that is usually .001" over the pin size... this allows the pin to move while still indexing the knife. I like to "shoulder in" the pin... imagine a linerlock with pins in the liners and a scale covering them... I hope that makes sense!