glide tape
japanese glide tape is a product developed to shim centerboard housings for racing dingies. it is super low friction teflon tape about 1/16 inches thick by 3/4 wide. it is sold through APS (anapolis performance sailing) it is not prohibitively priced, but considerably more than duct tape. it not only reduces friction, but raises the hatch so it clears the obstruction due to wear. place the tape on the sides and underneath the hatch and you will be amazed. i did mine 3 years ago and it has no sign of wear (we live aboard so the hatch is cycled several times a day) i also put some on the bottom of my dingy to reduce friction pulling it up on the dingy dock. before, it took both my wife and i ....now i do it with one hand.