My M250 has always exhibited slipping of the dials on the cross-slide, initially not too serious and easy too recognize and allow for.

But it got worse during a recent screw-cutting job and the decision made to dis-assemble to clean and fettle as appropriate, how hard could it be ?
Bad mistake.

These dual scaled dials are a nightmare to re-assemble onto the screw shaft.
Assembly appears to require positioning a Woodruff key at the bottom of an annular tunnel and engaging a matching piece without guides, visibility or ability too observe/check final positioning.

This is a cry for help from anyone with experience of Harrison dual scaled dials.

Thanks in advance,
John.


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