On the offchance that someone has a Sieg X1 micro mill with the small table, I just upgraded mine to the larger version (from 240mm to 400mm). Pictures and blurb at...
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I got the bits (table and longer metric leadscrew) from Arc Euro Trade. First time I've bought from them, and I have to say that the service and delivery was first rate. This was a marked contrast to Chester, who were unable to extract a metric MT2 collet with an M10 drawbar thread from a large box of metric MT2 collets with M10 drawbar threads. Four times in a row. Anyway...Haven't used the new table in anger yet, but everything feels okay, if a little tight and stiff. I'll give some time to bed in and then see if anything needs adjusting. The main difference I'm hoping for is the ability to clamp larger jobs - the small table runs out of room if you assume 2" at each end for clamps, while the new one has bags of room left over. It'll also let me try my rotary table vertically with its tailstock.