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[quote user="RVFLYER"] I had the same problem. I spent an entire Sunday afternoon documenting move accuracy. I found most moves varied about .015 inch mismatch at the rail head; occasionally twice that. I could also document about .005-.010 inch eccentricity. If you are DC my solution is not appropriate. I finally took the entire Walther's control system out and replaced it with a DCC Decoder (Digitrax DH126D). I used the existing Walther's contact wipers to bring power up to the bridge track. I actually doubled up on contacts since there are four rings and now I only need two coonduction paths (you have to connect the two halves of the outer ring). I then used a Digitrax automatic reversing unit (AR-1) to take care of the phase reversing when the bridge reverses. The motor drive is a double worm drive so on speed step one or two, the bridge creeps extremely slow so it is possible to get perfect track alignment. In my case, speed step 30 exactly duplicates the normal Walthers speed. The other advantage I now have, is that I don't get that sound and light shutdown as the bridge rotates through the dead zone as was necessary in the Walthers arrangement. Of course you have to be close enough to see when rails are aligned. <div style="clear:both;"> </div> [/quote] RVFLYER,  Can you provide photos and a wiring diagram of your installation.  I was planning on doing this myself with both my 130' and 90' turtables.
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