I'm fitting 138mm skirting through a house. I can only find a mitre box 100mm high, or a clamping mitre box (where the timber lies horizontally) 120mm wide.
How can i cut the joints for of the skirting?
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Use the mitre box to guide the saw but make the cut outside the box.
EDIT: This is the correct answer to the wrong question. OP is asking about cutting material that is too high for the mitre box; this answer is good for material that is too wide for the box.
So the analogue of my technique for op's too-high material would be to clamp a spacer under the mitre box to raise its top to 140mm above the table, hold the material tightly against the box, and cut part-way through the material.
The cut can be finished off by placing the material inside the mitre box as usual.