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from memory I only ever had a small piece of copper water pipe doubled over underneath my ramp...didnt have anything up through groove,just enough under it to give desired elevation. cut a piece out...

the bolt on her looks similar to what mine was...it locks by the handle only..eg handle is THE lug....mine loved winchester superspeed,power point not so much. I learnt to run mine with a little oil...

if its anything like the single shot remington I had of similar vintage it will be very accurate....
you look after her,that old lady deserves a good home.