I don't believe there is a nylon washer that’s supposed to be in the area you’re looking at. Hopefully Sully can verify that with a pic of his setup.
I think you have one of two possible problems:
1. Do you have a black nylon spacer installed on the scope retaining knob (the knob OPPOSITE the controller/encoder side…not the tensioning knob with the white nylon spacer)? If you do have that black spacer installed, remove it. It is only used for proper spacing if the Intelliscope encoders are not installed. If the encoders are installed, remove the spacer. There should be no spacers or washers on that side. Just screw the knob in. On the other side, the encoder side, you should have a white nylon washer and a metal washer on the tensioning knob, which should be tightened first until there is slight tension in the mount. Then tighten the other knob making sure there’s no washers or spacers installed.
Here’s another problem you may be having:
2. ( Quoted from T Cambell on another forum):
"<Begin Quote> Problem #2:
.......<snip>.......The optical tube rests on the cradle and is secured by the two knobs. One of those knobs has a pin with another encoder disk. The encoder sensor is attached to the side arm of the cradle support. When the optical tube is moved up or down in altitude, the disk should rotate with the optical tube so that the sensor (fixed to the side of the cradle) can detect how much the scope has been moved in altitude. We found that disk was sticking and failing to rotate. The reason has to do with how it's attached to the pin. There is a "spring clip" on the shaft of the pin (the type that requires spring-clip pliers to spread the tiny holes on the c-clip). It thought there wold be a groove on the shaft to hold the c-clip in position... there is not. It's simply friction holding it in place. Between the c-clip and the encoder disk is a small wavy spring-washer. Over the years of attaching and snugging the optical tube onto the cradle, that clip works it's way down -- compressing the spring washer until it is very tight against the encoder disk and this seizes the encoder disk so that it remains stationary when the optical tube is moved (hence the encoder can't detect that the tube has changed in altitude.)
My solution here was to use spring clip pliers to loosen the clip and back it off by a millimeter or two. I also put a tiny amount of powdered graphite (dry lubricant) on to help it rotate more easily -- but before doing this I had to mask the electronics with some masking tape (I did not want the dust of the graphite getting into the electronics). After working in the graphite, I blew off the excess.
The intelliscope now navigates perfectly once again. But I suspect we'll have to watch that c-clip every couple of years and back-it-off with the spring-clip pliers.
Incidentally, the altitude axis encoder has twice jammed up. The first time it happened the scope was still under warranty. We didn't know about the c-clip. When we spoke to Orion on the phone, they just sent us a new encoder assembly and that fixed the problem. Now that the scope is out of warranty, we had to figure out why it had the failure and that's when we discovered the c-clip that slides down the shaft and over-tightens the encoder disk until it can't rotate freely.
It's a very simple maintenance task that I suspect many intelliscope owners probably need to do from time to time. I think a small groove on the encoder disk shaft to hold the c-clip in position (so it can't work it's way down the shaft) would be a big improvement."<EndQuote>