Question about X4 dock sliding cover

[rkawakami]

I recently bought this X4 dock for my X41t: http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... 0299098568

As pictured, it shows the sliding cover (with the tri-color IBM logo) which I assume moves to fill in the gap when using the smaller-sized battery. The unit that arrived does not have this cover and I was wondering if there's some other function that it might provide: Here's what mine looks like:

http://www.kawakami-ca.com/ibm_x4x/img_8786m.jpg (640 x 480; 100KB)

I'm trying to decide whether or not to return the unit. Functionally, it seems to work just fine without the slider.

edit: I've checked the X41 Tablet HMM and this piece is apparently called an "adjuster" and has a separate FRU (26R8537)
edit2: Corrected "Ultrabase" to "dock"

[sjthinkpader]

I don't know why they did it that way other than lower cost. It should use a sliding cover like the 2878 type docks. I would just use it.

[rkawakami]

Received an unexpected present in the mail today:

http://www.kawakami-ca.com/ibm_x4x/img_8802m.jpg (400 x 120; 15KB)

Now that I see exactly what it is, it does really appear to be a non-essential item. I was thinking that it was a spring-loaded slider like what's on some other docking stations. This is just a plastic cover which is manually moved to one of three positions .

[Treefrogfarmer]

I picked up a used X41 Tablet and quite naively set out to purchase an X4 UltraBase. After I ordered it, I found the statement in the Thinkwiki that the X4 Ultrabase was "incompatible" with the X41 Tablet. I was quite bummed.
The unit I received was a ThinkPad X4 UltraBase P/N 91P9283; FRU P/N 91P9282. At first sight it appeared to be too small to accommodate the Tablet but surprisingly it does match up and dock the Tablet, although it appears quite awkward-there is a gap at the bottom front of the Tablet and the UltraBase of approximately 3/16th of an inch. I assume the non-Tablet X40 and X41's have a slightly smaller footprint and match up to the X4 UltraBase more cleanly.
On testing, the power plug, usb ports and telephone out on the base all work flawlessly
I don't currently have any Ultra Slim devices to test the expansion slot but feel confident
this will work as well.
I guess I'll have to post to the ThinkWiki now

[keithsketchley]

Good news the x4 Ultrabase fits.
But is the stylus compartment usable?

[keithsketchley]

FYI on fitting standard x41 into x4 Dock.

Apparently there is a mark on the Table version to help align with dock.
The standard version is workable if you get the sliding cover in the right place for your battery, should be a small gap, and are careful.
However I suggest marking the side of its case, or the outside of the lid, with white or silver paint (I used a silver marker pen but they tend to be watery for smooth surfaces).

With either dock make sure the computer is fully seated else your optical drive may not work.