Period vs mass ratio for one of the targets (G-2966), showing the evolution of the period as mass is transferred from the donor to the accretor. Solid lines use present-day parameters found in this work (S+25), while dotted lines use the results from EB+22. The present-day locations of the systems in the P − q plane are marked with black (this work) and grey (EB+22) stars. Arrows indicate the direction of evolution as mass is transferred from the donor onto the accretor. The minimum Period is shown as a grey horizontal stripe, with colours indicating the donor mass on the main-sequence. We see that the higher mass ratio from EB+22 places a much tighter constraint on the how conservative mass transfer was, than the lower estimates found in this work. For this object in particular, the present-day mass ratio and Period from EB+22 require almost fully conservative mass transfer to avoid a merger.