I have a nice home from 1920 that I am leasing to tenants. There is a beautiful wood stair rail going up the stairs and along the side of the stairs. The city inspector said the railing is too loose and I must tighten it. The spindles are fully twisted in place. The railing is probably exactly like it was when put there over 90 years ago. If you were to violently shake the rail it may wobble, but it is not dangerous in my opinion. How do I firm this up without destroying the esthetics?