Staircase consists of American cherry handrail and newel post, iron balusters. Attachment of handrail to wall and newel is lag bolts which will be covered by flush plugs. Knee wall will be painted white. So, the stain finish concern involves only handrail and newel. No problem to dismantle and spray finish those parts. Should I use conversion finish or other? Or, try to finish leaving assembled in place? Finishing disassembled has me worried about getting the plugs in and looking right, especially with a conversion varnish.