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Of course you can lock the S70 VariLock. Adjust the length by turning the knurled outer ring and lock it by turn in the side with the S70 male. To
avoid tilt problems all UFC parts are manufactored very precise. Please hold in mind that some camera manufactorers build in the sensor not
so pretty exactly so you may have to turn the push/pull screws from the RASA anyway.
Okay, after setting the length of the S70 VariLock to 18,8mm (please controll it by using a good caliber) you should have a good start. Or set it
to 19,5mm when using 2mm thick filters. As a rule of thumb the focus point gets lay out to extra focal at a third of the filter thickness (~0,7mm)
because of refraction. To stay homo focal and to receive lights it is of advantage using a clear glass or UV/IF filter.

You need an 1.3mm Allen key/hexagon socket wrench.

Only our discontinued Classic Steeltrack NT focuser was able using the holes when disassembling the original Sky-Watcher focuser. Then only
when having the focus wheel axis 45° to the OTA axis.

Please notice our website for instructions how to mount the Diamond Steeltrack - as you can see there have to be new holes done to mount it.
You need to have access to the inner tube holding the nuts but the Makstutov Correctore is closing it - I´m sorry.

Unfortunately, we do not have the technical data of all telescopes. So, I'd ask you to either measure the dimensions of the back of your telescope and send them to us, or to ask the manufacturer (Astroshop) to provide the data. As they also sell our Clicklocks, they'll probably be able to help you, too.

We recommend that you focus at high power and then zoom out. Usually, you do not have to adjust the focus then, or only a little bit - this depends also on the possibility of your eyes for accomodation. In any way, there will not much refocussing be necessary - usually it's only the testing to see if you really have already achieved the best focus.