IF you have a comp-tip you will be unable to reef the main. This is due to the construction of the comp-tip. yes it is necessary to use a teflon spacer or spacer of some kind between the mast amd mast base or you will have metal to matal contact and scoring will occur. You can use a lot of things instead of the teflon washer such as the cap to a two liter bottle of soda or a quarter (dissimular metal) just some thoughts. <br><br>