Not sure where to post this question so I am adding it here. I am about to refinish a mcm credenza made in 1965 by the Honderich co of Ontario. When I removed the sliding doors from their tracks, I noticed that the backs of doors are taped. Since it is all 3 of them and the tape itself looks old, it appears that this is part of the manufacturing. Can anyone explain why they would make the doors this way? Thanksdoor1.jpgdoor2.jpg