I bought it off an independent tool guy/truck back in 1972 when I was wrenchin' on Mazda rotaries. It's a heavy little sucker! I do believe its time to put in the vane/rebuild kit, though. It seems to have lost some oomph!
" But let me tell you something ,folks: You can't fix stupid!
There's not a pill you can take, there's not a class you can go to. Stupid is forever!"