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Awesome video, thank you!! Been trying (and kind of failing) to sharpen both my 2x bevel (Seller’s style) and diamond marking knives, happy you explained both processes. Clear, encouraging and detailed, 🙏🏽

Haven't seen method 2 before, makes a lot of sense with thin blades.

A couple of years ago, I decided to buy a Stanley version of your double bevel knife (I think they're all pretty much the same, really; just a handle that accepts the same blades, like utility knives from all the manufacturers). It came with a blade fitted and 4 spares. Until learning that the blade will last for two years with regular sharpening on Paul Sellers' channel, I thought I would have to replace it every time it got dull. So, I also bought a small box of 50 Swann-Morton 01 replacement blades (again, cheap to buy). That means (because I am still using the first blade) I have enough blades to last me 110 years < YAAY...! >. The problem is - I am already 61. 😐 Prior to buying the marking knife, I had used a conventional utility knife for decades but always found it to be a bit too...I don't know...'blocky' springs to mind; too hefty - too unwieldy, clunky. The 'marking' knife (which is actually just a general craft knife) works much better and has a lot more finesse about it - more like holding a sharp pencil than the 'felt marker' experience of the utility knife. Finally, I have never tried using a single bevel 'designated' marking knife because of that awkward geometry. Again, it looks clunky, much too thick, like using a felling axe to split matchsticks; something's got to give and I think it will be in the bruising!

I sharp marking knife is underappreciated in most workshop. Even some youtubers their marking lines look cut with a dull machete.