I bought a set of scope alignment wedges to try out .I bought then from Amazon .
they work on full length picatinny , and weaver rails . the idea behind the tool is to put the lower piece on the scope rail and use the appropriate wedge to go against the flat on the bottom of the scope . the top of the wedge stays level regardless of how far it's pushed in. there is a little square engraved on the top corner of each wedge .

my first try was putting a LEUPOLD 6-18 with target turrets on my grandsons 22 rimfire . I took this scope off of my Tikka 22 . I slid the bottom part of the tool on the rail and chose the smallest wedge . I get to looking , and the bottom of the Leupold scope is not completely flat , but rounded on one side .this rounded base is not letting the wedge stay flat in the lower part of the tool . as I pushed the wedge in , it was turning the scope a little too . I put the tool in from the other side and worked around the windage knob . this way seemed to work ok .

the bottom of the Leupold scope is built the same way as this Nikon .

my next try with the wedge tool was my Tikka T1X 22 rimfire . I was putting an extra scope I have on it . this scope has a lot more elevation , than the Leupold scope has . this scope has a nice flat bottom that will be ideal for the scope wedge tool .

so I get the scope setting in the slightly loose rings . I put the base of the wedge tool on the scope rail . I choose the smallest wedge, and it barely goes in . it's too tall to be able to be used . so I'm back to the way I've done it in the past , feeler gauges .

the tool will work , if your set up allows it to . I thought it would be a quick simple way of getting the scope mounted square to the scope rail . there are a lot of variables involved to being able to use it . I have a couple more scopes I'm switching around . I'll try the wedge tool again , to see if it can be used . after I get these scopes all switched around , I'll probably just grab my feeler gauges .
a word of caution ; you need to be careful using either method . when you put something between the scope and the rail , you cannot just tighten down the rings , you'll bend the scope . you need to keep slightly pushing the wedge out as you snug the rings . or keep taking out some of the feeler gauge as you snug the rings .
they work on full length picatinny , and weaver rails . the idea behind the tool is to put the lower piece on the scope rail and use the appropriate wedge to go against the flat on the bottom of the scope . the top of the wedge stays level regardless of how far it's pushed in. there is a little square engraved on the top corner of each wedge .

my first try was putting a LEUPOLD 6-18 with target turrets on my grandsons 22 rimfire . I took this scope off of my Tikka 22 . I slid the bottom part of the tool on the rail and chose the smallest wedge . I get to looking , and the bottom of the Leupold scope is not completely flat , but rounded on one side .this rounded base is not letting the wedge stay flat in the lower part of the tool . as I pushed the wedge in , it was turning the scope a little too . I put the tool in from the other side and worked around the windage knob . this way seemed to work ok .

the bottom of the Leupold scope is built the same way as this Nikon .

my next try with the wedge tool was my Tikka T1X 22 rimfire . I was putting an extra scope I have on it . this scope has a lot more elevation , than the Leupold scope has . this scope has a nice flat bottom that will be ideal for the scope wedge tool .

so I get the scope setting in the slightly loose rings . I put the base of the wedge tool on the scope rail . I choose the smallest wedge, and it barely goes in . it's too tall to be able to be used . so I'm back to the way I've done it in the past , feeler gauges .

the tool will work , if your set up allows it to . I thought it would be a quick simple way of getting the scope mounted square to the scope rail . there are a lot of variables involved to being able to use it . I have a couple more scopes I'm switching around . I'll try the wedge tool again , to see if it can be used . after I get these scopes all switched around , I'll probably just grab my feeler gauges .
a word of caution ; you need to be careful using either method . when you put something between the scope and the rail , you cannot just tighten down the rings , you'll bend the scope . you need to keep slightly pushing the wedge out as you snug the rings . or keep taking out some of the feeler gauge as you snug the rings .