IKR, Go to aa-mfg.com and get the housings (assuming that you do not have a lathe to turn them). They are about a buck apiece. Then go to Grainger and get a piece of 36" drill rod along with bronze hat bushings. Total cost here rod $20 divided by 8 pieces at 4 inches equal $2.50 each and $2 each for the bushings. They are oilite (meaning that they are impregnated with oil and do not need a grease fitting but if you still want one add 25 cents at Grainger). Ace Hardware has all of this too, do not use dowell rod, it must be drill stock. Cut the drill rod and tap the whole thing together with a mallet. Total cost about $10 per side and total time about 10 minutes. Zero wobble.