I suggested dropping the subject.and will. From long experience I know what does and doesn'rt work with vegetable tanned leather. Bye.
The only Milt Sparks holster that was too tight was for one of my SIG pistols. I wrapped it in a zip lock bag andstuffed it into the holster. I checked it daily for three days and then forgot about it. Two weeks later, the gun fit in the holster perfectly.
