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@noBlakes
ahhh i feel so knowledgable :) crown on my alpinas is 45mm as well (it does seem it varies a bit though), not sure on the drilling on them though, people have done it and there is an area where it looks like it's meant to be drilled so should be fine, still though, i'd rather find out from the people themselves. let us know what they say, might possibly end up doing it myself