Problem with fitting my scope recoil pin into my rifle (GAMO scope on cometa 400

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The recoil is too strong to do without a recoil pin which was included when i bought the scope. However the holes on my cometa rifle are too small for the recoil pin to fit in. I thought the size of these recoil pins was standard and should fit on any air rifle. Should I return the scope to sender or just manually drill bigger holes? Anyone has experience with similar issues?
 
as stated don't drill the rifle

can you chuck up the pin in a drill and remove enough material so it will fit, it would be my first choice

but the pin might be heat treated and very hard

you could try to find another dog point set screw that will fit your tubes pin hole, not knowing your mounts, rings are made I have no idea if it metric or inch pattern 

you can find dog point screws on Ebay

https://www.google.com/search?safe=off&rlz=1T4GUEA_enUS644US645&ei=AcfmXYO8FYH_-gTAorqoDg&q=dog+point+set+screw&oq=dog+point+set+screw&gs_l=psy-ab.1.0.0j0i7i30j0l2j0i7i30l2j0j0i30l3.16814.17741..19867...0.2..0.77.335.5......0....1..gws-wiz.......0i71.x2q3lsIckic#spf=1575405332803

good luck