I noticed today that the dovetail rings I have been buying for my 22lr rifles have flat bases which give full contact on their rails. However they only offer 3 points of contact on my new Hatsan rifle which is curved and looks like all the other rails I see on close ups of other air rifles. The rings on the scope from Hatsan are curved on the bottom offering full contact. Does anyone know where to get rings that have the curve in them? Or is this a job for Mr. Dremel? On the rings not the rifle.