Hey there:
This is an easy, easy solution. Get the Weaver "clamp-on" type base. They look good, fit good, and they actually look like they were made to fit by Ruger. I have them on mine, and I love them. There is a place on the internet who has the best prices on them. Believe me, you can't go wrong on this mount and base. I clamps on the receiver.
I'll see if I can find the place I bought mine, and get back with you. I have no connection with the business, just a happy customer and good prices.
casper_zip
I've seen one of them on sixgun,dot,com I'll post it for you in a bit
Have you looked into the One Ragged Hole type sights
Reason I say this, I too am gong through
aged eye syndrome ,I have contenders with scope's
as I get older (wiser I hope to think) Scopes Don't belong on hand guns IMHO
Unless you shoot long and bagged type shots
Old eyes don't take to the little notch and dot up front very well either,
These Ragged Hole things seem like they maybe my ticket
I have made my own and I like it ,it by no means will work If I shoot the gun but ,its a Mock up of the real thing
when I draw and Point it seems I can pick up on targets and no eye Strain
also here on GBO is one made (home made) that slips right into your gun sight it replaces the notch with a Hole.
Its a good Post on how to make it.
It will be my very first before I spend 100 on anything else.
I'll post that Link for you as soon as I find it.
Tommyt
heres one pic
another