A 1903 Springfield 'safety-lever' has been fitted to this Krag Bolt.

I cringe to think of the alterations to the Bolt-Sleeve and shaft of the 1903 Safety, that were done to make this work, (if it does).

The 'Pipe-Wrench Marks' on the Striker-Knob reveal the level of craftsmanship.

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  :'( :'( :'( :'( :'( :'(

I ordered a safety from Numrich once.  I don't know what they sent, but it fit.  The shaft went in the hole, but it didn't work the safety!  By the time I figured that out, as I had bought it for a friend, it was too late to return it.  I finally got him a proper safety for his 98.  Those folks at Numrich will try to substitute whatever they can on your order, without checking with you!

I looked into the same exact scenario one time. Immediately one will see it's a low yield proposition and a definite step in the wrong direction. After looking at the picture quickly I do wonder if somehow just the lever itself was able to be pressed out and then in to a non modified cam shaft.
Even then if I remember correctly one would still have to overcome the difference in the relationship of the o3 plunger to the milling in the shroud vs the rear face of the combined parts.
Some things apparently are not worth the effort if a replacement is available even if your own labor is cheap or really bored.