That’s my buddy “grafting with machined tool.” He built it while he was working as a machine and tool die cast maker many-many years ago.
I have the 450$ Fieldcraft Topgrafter & the 22-30$ replicate. The 450$ tool will cut 1" wood but it cuts 3/4" cleaner. The replicate I can cut close to 1/2" I suppose but I had to use a round rasp file to notch out the top of the tool. If you look at the distance between the blades and the top of the tool that’s the maximum scion width that tool will cut. So I opened it up another 1/4". The Fieldcraft Topgrafter has a giant opening above the blades until it reaches metal. So that’s why the very less expensive tool needs that modification. Let me tell you for 30$ that tool is worth its’ weight in gold. It works awesome.
The omega tools cut the omega of course but “stiff” wood is tough to get complete contact inside the omega shape. a V cut isn’t difficult to wrap two scion and rootstock tight. You can’t do that with omega.
I didn’t watch the first video but I’m going to assume it’s the Topgrafter tool set up mechanically. The Fieldcraft comes as a manual or electrical set-up.
Dax
Those are the four links from that thread you should look at. There’s a red one and a tan one. The guys say the red one is built better. You can get them on Amazon and Ebay all day and night.
I bought a bunch of extra replacement blades because I like having years and years and years worth of “tools” ready to go. https://de.aliexpress.com/item/2017-Hot-blade-Free-Shipping-vegetable-grafter-tree-grafting-tool-Spare-blade-fruit-engrafter-Fruit-Trees/32799015736.html?spm=a2g0x.search0104.3.1.1sYOjS&ws_ab_test=searchweb0_0,searchweb201602_1_10152_10065_10151_10344_10068_10130_10345_10324_10342_10547_10325_10343_10546_10340_10341_10548_10545_10541_10562_10084_10083_10307_5680011_10178_10060_10155_10154_10056_10055_10539_10537_10312_10059_10313_10314_10534_10533_100031_10103_10073_10102_10557_10558_10142_10107