As you've got the jigsaw out already, I find it alot simpler to do the four cuts using the jigsaw. If you've got the wood clamped into the vice its pretty simple to do the cuts using the jigsaw leaning against the edge, you then give it a tap from the back and the section with the check comes out!
I saw the front wheel of the motorcycle in the background, and immediately thought that looks like a Honda CX500, and sure enough you step aside for a brief minute, and revealed that it was!
To anyone who pays attention. Traditional sash frames were not cut to the edge. So I ask,? How did they do it.? The cuts are clean and straight, NO power tools. Anyone???
I've tried with a jigsaw but the end knocked in to and damaged the parting bead groove. Do you use a spacer so the stroke of the jigsaw doesn't go too far? It would be good to see how you do it the "modern way".
Good video agbagb123. I can see how you can cut it with a jigsaw by standing the timber on its edge. the blade would need to be long enough to cut the full width but short enough not to bottom out on the face of the parting bead groove. Or you would need to pack between the stock and the jigsaw sole. Whacking with a chisel sounds easier.