Diana Diana scope rail loose

they look like Phillips screws but they are not
for any of us that has tried to remove a Diana scope mount----ME----you just screw up the screw top
the gun would have to be taken apart as far as i know to get to the back of the rivet and then what spin the back of the screw rivet
now this is a 48-52 tube and what you are looking at is the rear most screw end at the right and a locator pin that is on the mount
you can see that the screw has been worked over to peen it
and every screw has access though the tube
now i would assume your is similar
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they look like Phillips screws but they are not
for any of us that has tried to remove a Diana scope mount----ME----you just screw up the screw top
the gun would have to be taken apart as far as i know to get to the back of the rivet and then what spin the back of the screw rivet
now this is a 48-52 tube and what you are looking at is the rear most screw end at the right and a locator pin that is on the mount
you can see that the screw has been worked over to peen it
and every screw has access though the tube
now i would assume your is similar
View attachment 582814
Reread your post and thought it though. suspect careful work with a punch may work
 
Link below. This was a bigger job than yours but gives you an idea. Not a job for the faint of heart. And Hector is as good as it gets with Diana airguns.

 
Charlies yes and no
the punch would work i guess but you still have to take the gun down to a bare tube at least in the back
now you would have to have the rifle held and the Phillips screw bucked with a screwdriver and then get in there and give a whack
now if the edge of the screw rivet has fracture off it might not be long enough to rebite
this is a little problem that is a huge PITA
those mounts that Hector used are on Ebay for a few bucks i have some that i have made Diana 5-6 mount for
but they are ugly and need to be refinished
now i hate to disagree with Hector but i will you see a Weaver mount would have be better and the why is you can get them with round bottoms
now with the round bottom the mount will always set north and south front to back it has no choice
you job would be to clock the mount top dead center, and you will have the old holes to use
but you are still in the weeds the gun still has to come apart
could it be screwed on maybe, could it be screwed on and epoxied better choice, could it be riveted on from the inside out where the rivet is peened on the outside i like that idea
BUT EVERYONE OF THOSE IS A HUGE PITA
here is that mount
https://www.ebay.com/itm/192258428863

that is my opinion and some ideas but maybe the rivet from the inside out is the best
 
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