Bought a M2 with a 9128 nib on 'fleabay' for £25 as a needs repair job. Was a risk, but if the nib was fine it was a steel and it would go in to my J. Pen arrived today and all that is wrong is the sac, or lack there of. All else seems fine and the nib works well in my other estie (though on cheap paper it does snag - under a loup the nib seems fine). However, as with all things in the pen world I thought ... how hard can it be <sound of rolling thunder in the background>. Watched some YouTube videos but I seem to get conflicting advice on the sac. Some sites say it should be size 14, others 16. I do not have an accurate way of measuring the peg, which does not help.
All advice welcome.