Here's the easiest, cheapest way to do this:
1. Obtain a "crock pot" (or similar) that has a heating control that will keep the liquid in the hot (but not boiling) range. (there's probably one in your kitchen)
2. Get a piece of PVC 3" pipe (2" might fit -- check the measurements) cut to about 3' long. Screw or glue a cap to one end.
3. Put the pipe, cap side down, vertically into the crock pot, then fill the crock pot with water, and turn up heat. Tie down the pipe so it is stable.
4. Put the fore end into the pipe.
5. Fill the pipe with boiled
linseed oil
.
6. Put a meat thermometer in the oil to check temperature.
7. Let this continue for 1-2 days.
8. Remove the fore end and let the oil drip into a pan until it stops.
9. Then burnish the surface with rapid motion with an old towel to remove excess and help polymerize the surface.
10. Don't put it in the sun to dry as that could actually warp the wood.