After using my modified Skerton for a while, I though it might be appropriate to add some comments.
1) It works.
2) I did need to re-tighten the 4 screws that hold the outer burr retainer in place (my plate goes around these small posts) - I hand fitted the plate but evidently some settling has taken place. this adjustment was done only once after grinding some beans - the plate has not worked loose again so I do not think longer screws are a necessity.
3) No "tweaking" is required to produce even size grinding - Maybe because the grinder is still relatively new (less than one year old) and everything still fits tightly.
4) the center hole in the plate (remember, it is fabricated out of metal scavenged from a nut container) is larger now. It might be enlarged because I took the inner burr out (originally I used the shaft to finish stretching the hole so it was snug) to examine the plate for wear several times - but it still stabilizes the center shaft. If I turn the handle while holding the grinder (without the bottom jar attached) at eye level and watching the inner burr turn at a French press size setting, hear no burr rub and the path of the inner burr is smooth and level.
I posted some images here:
Hario Skerton / Open Top Hand Grinder Lid