Deciding to make new hinges and just bolting them on is a bit stickier than that. Any mis- alignment of the hinges will make your control surface bind. To maintain alignment when mounting them is maintained by using a proper diameter steel rod inserted through the hinges and when you swivel the control surface spar ( elevator or rudder) it must be free moving and there can be no flexing of the spars. If you are replacing the hinges because they are galled and there is play in the hinge, consider re using them. Either use sintered bronze bushings and redrill what you have or even better use Garlock DU series bearings what they are is a steel jacket that has a coating on the inside that is lead impregnated teflon and the claim is that they are good for 5000 hrs.moderate use. If your hinge pins are AN3 aircraft bolts 3/16 inch diameter. the Garlock bearings are only 1/4 inch O.D so all You have to do is redrill your hinge pin holes to 1/4 inch , they are split down the sides so they'll maintain tension in the hole and won't spin. On my KR 1 I have 3 inspection holes 1 on the rear turtle deck to inspect upper elevator cable pulley, 1 on the left side to inspect the lower elevator cable where it attaches to the bellcrank and the other on the right side and I cover that hole with a 4 3/4" domed inspection cover used on inspection holes in fabric covered airplanes Hope this all is of some help to you
