Re: HA-114 Treble springs adjust with Butter Knife or ?
Hohner makes diatonic accordion springs in three degrees of stiffness. The Corona model, for example, uses light, medium & heavy gauge springs respectively, for each of its 3 rows. The HA-114 uses the heavy gauge (approx .025" dia.) springs since it has fairly long & heavy pallet valves. I've found that substituting the light gauge (approx .022" dia.) springs works fine & improves the action considerably. I used to order the springs directly from Hohner (part #TA20151), but I have been winding my own replacement springs from #9 gauge (.022" dia.) music wire with considerable success for some while.