I agree that the Gotoh tuners on the solid headstock Orpheums are poor and I have replacement tuners ready to drop in at the next string change on mine. However, I have not heard the same complaints from the slothead tuners on Orpheums. My understanding is that they are the Golden Age tuners from Stewmac. Comparing the mounting hole patterns using Stewmac specs the Golden Age tuners (the square end ones that match the looks of the ones used on the Orpheums) and Waverly tuners, the distance between the mounting holes do not match. The spacing between the tuning post are the same but the diameter of the tuning post are different (Golden Age are 6mm vs 6.32mm on Waverly). Not sure if the larger diameter would require the holes to be enlarged. Does not look like a matching drop in replacement based upon the specs on the Stewmac website unless Guild had a custom set made with different specs. I don’t have a slothead Orpheum to measure and confirm.