That should be fine Dave I would have thought, it's not carrying any weight and ther are no forces acting on it after all. For complete ease of maintenance could you not turn the torch mount through 90° (gap facing the front) and use one of the fixing bolts (now coming in from the right and tightening into tapped holes in the 5mm steel plate) to tighten the clamp? I'm not sure from the drawing if there's ease of access to get to the torch mount?