Greg, The Renner drill bit has a countersink built in. This makes fast work of drilling both the pilot hole and countersink at the same time. It would be difficult to use a regular countersink since the holes are close to the tray. You need something long and not too wide to get in there. There are other options like a step drill or the type of countersink that attaches to the bits' shank but they would be harder to find. W.L. Fuller has the counter sinks and can make custom drill bits but I don't know how much of a savings they would be. I use a custom step drill for drilling the tray holes. Originaly I designed this bit for drilling new Steinway tubular action frames but it works on the Renner kit just as well. I say buy the bit from Renner. John Hartman RPT John Hartman Pianos [link redacted at request of site owner - Jul 25, 2015] Rebuilding Steinway and Mason & Hamlin Grand Pianos Since 1979 Piano Technicians Journal Journal Illustrator/Contributing Editor Greg Newell wrote: > > Lists, > > For those of you who have installed a "Renner" back action on an S & S > "D", do I need the special $40 drill bit? I have a fairly good > assortment of drill bits, numbered, lettered, and fractional. Is there > something special about the bit from Renner USA that makes the job > easier? Is it shank length or what? They seem reluctant to share the > information with me. > > Greg Newell > mailto:gnewell@ameritech.net
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