After having made my LX200 Piggy Back Rail I considered the 'tower with the Witty' not stable enough for Autoguiding and after a lot of thinking I constructed this "Home made Heavy Duty Piggy Back Rail for Auto Guiding".
Of course both rails are interchangeable and are attached to the OTA of the LX200 via brackets and wing nuts.

Material used: (costs: less than Euro 25 - I already had the aluminium base tube ...)

This is the PVC pipe joint as it came from the shop.

I used a hacksaw to separate the rings from the body.

A closer look at the rings.

I wanted to melt these M6 blind nuts in the inner side of the rings, but that did not work out at all.

I clipped the sharp tips off and attached the blind nuts with hot glue at the rings.
A bit later I found out that also the hot glue was not good enough so I used aluminium strips to keep the blind nuts in place.

The adjusters are made of threaded rod with M6 knobs at the top.
In the DIY shop I found plastic tips with M6 inner thread; I used the hacksaw to arrive at the proper length.
Later I found out that these plastic tips were not the right solution for this job; I have replaced them with metal M6 Acorn Cap Nuts.

I flattened the bottom of the rings to get a flat surface and fastened the rings to the aluminium base tube with M6 bolts and wingnuts.
For extra stability I connected the rings with each other with sturdy aluminium bars.
As I want to be able to use both my 300mm and 400mm SLR Photolens I can put the front ring in different positions.
When using the lenses I first must focus them before tightening the adjusters, because the SLR Photolens shifts in and out while focusing.
I had to shorten one of the adjusters because it collided with my finder.

The underside ...
The wingnuts make it easy to reposition the rings without the need for tools.
Inside the rings you see aluminium strips to keep the blind nuts in place: hog glue alone was not enough ...

The whole assembly - with 400mm SLR Photolens and webcam - mounted on top of my LX200.
Please also note the home made dew shield

The 400mm SLR Photolens mounted
You can see that I had to shorten one of the adjusters as it collided with the finder.

The rail is mounted on the OTA via brackets, which once were intended to spend their live as drawer handles.
The LX200 bolts are long enough to fasten the brackets on the OTA.
The wingnuts make it easy to assemble/disassemble.

The 400mm SLR Photolens pointing at the sky ...

And here is the whole assembly again, but now with my 300mm SLR Photolens.
Please note that the upper ring is now in a lower position so that it can grab the 300mm SLR Photolens, which - not surprisingly - has different dimensions than the 400mm SLR Photolens.
Swapping SLR Photolenses takes me about 5 minutes ...

LX200 with piggy-backed Lidl scope February 24, 2006.
LX200 with piggy-backed Lidl scope

LX200 with piggy-backed Lidl scope February 24, 2006.
LX200 with piggy-backed Lidl scope: clearance 7,5 cm

LX200 with piggy-backed Lidl scope February 24, 2006.
LX200 with piggy-backed Lidl scope
In the background you see the just completed Hartmann Mask.

Here follows a list of all my Home Made LX200 based Piggy Back Rails:
Base Piggy Back Model
Balance Rail
Piggy Back for WO ZS 80 ED APO
Piggy Back for Filterwheel + SLR Photolens