Hi Neil, I have three Stanley ones to hand, a 10-550 Titan fixed blade with the yellow scabbard, a 99E retractable, and a 199 fixed blade one, which currently holds a Stanley metal saw blade. I also have a Wilko Titan look-a-like with a blue scabbard, a foreign one, which also currently holds a Stanley metal saw blade, a rolson fold-up one, and a cheap plastic retractable one, these all take the same blades as the Stanley’s do.
I might have one or two other Stanley one’s hiding away in my garage, but I do have a Stanley FatMax retractable snap off, and a similar Magnusson, both of which have a screw pushing a pressure plate, which locks the blade in position when in use, but will also stop the blade being accidently pushed out, when not being used, plus another similar one from Aldi’s, but it doesn’t have the screw and pressure plate locking feature, instead it just relies on a pin on the blade slide, dropping into cut outs in the lower part of the frame to lock it into position both ways.
Regards Nick.