These blocks are made from super strong Delrin also known as Acetal. It is an engineering thermoplastic (Polyoxymethylene) used in precision parts that require high stiffness, low friction and excellent dimensional stability. In other words it will never shrink, expand, crack, twist or warp under any weather conditions and is UV stabilised.
Added to these great qualities is a new spring loaded tongue that never becomes depressed. The tongue will always open when the knob is loosened.
As of Nov 2009 all SDM Dobsonians will feature these innovative pole blocks.
Phil lives on the side of a hill overlooking beautiful green pastures in a lovely valley in Wyong Creek an hours drive north of Sydney. He has spent the last seven years converting an old post office into a delightful house for his his wife, three young children and two trusty old dogs.
At SDM the customer is always right and there is no better proof of this than when Anna and John wanted something a little different. So it was out with the old and in with the blue, and as you can see the result is stunning – just like the images that this compact produces with its premium grade Galaxy optics.