On 1/12/2013 10:57 AM, paul bruesch wrote: > The one P/B separation repair I've done had to compensate for a couple > of P/Rs done by yers trooly, so I absolutely had to let tension down. I > still found it to be very hard to tighten my pipe clamps, and even bent > one. I wound up letting it WAY down, at which point the clamps pulled it > closed quite nicely. If it's necessary, it's necessary. If not, not. Depends on what's there. > I used large washers in the back, but found the wood still crushed > fairly considerably. It occurred to me at the time that I may want to > glue on a 1/4" strip of maple or a hardwood plywood next time. Thoughts? Paul and Thumpe, Again, it depends. I've had them sink noticeably, but never drastically enough to consider it to be a problem. Here's a couple of photos of the bolt setup I use. It puts a pretty big footprint on the wood, for crush resistance, and sticks out the back about as far as the hinges already do. Looks neat and tidy too for the "Good Housekeeping" spiders living in luxury among the back posts. That's a 3/8" carriage bolt. The washer is a standard hardware store item, with a 1-3/8" OD, a 9/16" ID, and around 0.092" thick, depending on the batch. The hole in the washer fits over the square on the bolt shank under the head. Or, Mcmaster-Carr has washers 3"OD, 9/16"ID, and 1/4" thick at 5 for $14.80. I bet those suckers won't either bend or sink. Ron N -------------- next part -------------- A non-text attachment was scrubbed... Name: Back Bolt 1.jpg Type: image/jpeg Size: 29916 bytes Desc: not available URL: <https://www.moypiano.com/ptg/pianotech.php/attachments/20130112/6d9e0d9b/attachment-0002.jpg> -------------- next part -------------- A non-text attachment was scrubbed... Name: Back Bolt 2.jpg Type: image/jpeg Size: 50618 bytes Desc: not available URL: <https://www.moypiano.com/ptg/pianotech.php/attachments/20130112/6d9e0d9b/attachment-0003.jpg>
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