The new Heavy duty T-2 Quick Changer System #T2-6A,7 is a combination of parts #6A and 7. This is a much improved product in Baader's Astro T-2-System portfolio of telescope essentials. This changer-combo works similar to the standard T-2 Changing System #T2-6,7, but it is suitable for extremely heavy duty accessories. The difference between both Systems is part-no.6 versus part-no.6A. The (T2-6A) T-Quick Changer (with Zeiss pressure block) literally equals the Zeiss-original - only it incorporates a contemporary T-2 female thread (M42x0.75) instead of the Zeiss thread of M44. We are glad that this T-2 clamping/rotating system now is fit for the next 25 years. It will fasten almost any load with utmost security.