User Review: Optimus Svea
This stove and similar were rendered obsolete and retired along time ago for good reasons.
- fuel tank under the burner head represents a hazard
This stove and others very similar to it with provisions for pressurizing the fuel tank were deemed so dangerous by MSR that it was the major incentive to develop the XGK. A larger pot or prolonged use would cause the fuel tank under the burner head to overheat. In the case of the pressurized versions the result would be an ignited flame front into the user's face.
While the 123 does not have a pressurized tank there were seam failures and injuries reported. I would strongly suggest retirement for your stove.