What should be the allowance for press fitting?

[ukazak]

Thanks to you all

, I improvised, combined, little bit of every ones suggestions.

Dave, you asked for pictures, here they are, sorry for the fuzzy's

Well, I made a micro boring tool from an old and dull 4mm drill bit.



Fixed to QC holder,



Carefully bored (regularly stop and check), there was only 0.40mm to go.




So, stopped when I reached that 3.90mm dia.



Than pressed using my mills vice.



Made sure it is straight and perpendicular,



Checked again



Than did the others



All went fine. As it looks from the assembly,





If it works, it is worth the trouble, at least, learned that; if you want to keep out of a trouble, start right at the beginning.

Cheers,

Unal