I've put them on in the past with wooden pegs in place of the 2 screws.
The pad is glued into place for installation, The pegs make for a positive allaignment of the pad onto the stock.
It takes some time and careful preparation to make sure the pegs fit snugly into holes drilled into the facing of the pad. No room for a loose fit or the entire reason for doing this is lost.
The entire fit up is done first with the pad in it's oversized state. The pad is held in position with only a friction tight hold on the pegs as the pad is trimmed to the wood and finished.
Then the pad is leather covered.
When ready to install, the glue applied sparingly and the pad placed back onto the stock and pushed one last time onto the pegs & stock face.
A couple of long bar clamps hold it in place till the glue cures and it's done.
Since the pad was fitted in place on the pegs and it's fit on those pegs is extremely tight,,it goes right back on in the same position.
Don't over do the glue. Excess will squeeze out the sides and ruin the looks as you chase after it. You are doing this final assembly on the finished wood.
Yes it's in place permanetly,,but it's only done on a non-thru bolt type of stock.
Recoil pads are not something you take off and put back on just for fun and idle curiosity.
If it really does need to be replaced from damage or wear,,you can cut the bulk of it off, belt sand back to the original surface quite easily and do the same thing all over again.
All this style of installation really does is avoid the 'plugs' for the screws in the face of the leather cover pad.
The wooden pegs ensure correct allaignment if done carefully as well as offering some shear strength to the assembly.
I usually use standard 1/4" dia hardwood dowel for the pegs.
Just another way to do these.