So finally got around to fixing this. Removed top ram bolt and lifted the leg high (what a weight).
Used carbide drill bit, 3.5 - 4mm, applied light oil, lean into drill to apply weight and ran slow to moderate speed.
Used a bolt extractor tool. To be fair it wasn't seized, but pleasantly surprised on success.
New stainless Allen head and nut temporarily until I get new Allen bolt from Tohatsu.
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