I've just spent a frustrating afternoon, lashing up various combinations for an Explore 102mm f7. There will be more in another post about this. Along the way, I examined my collection - 4, I think, 1.25" to 2" adaptors. Every one has a loose locking screw. I am not sure if it is the accuracy of the tap used, the die used on the screw, or the poor quality of either piece of metal - This is my guess. probably the adaptor, as it doesn't get better when a stainless steel socket screw is used. Why are they all so poor, and does anyone make decent ones? I know that twist-lock/self centering ones are better, but if you want several, they cost a lot!