I have looked all over this site and can't find an answer.... I bought a bunch of pre-amps with a rod piezo and started to convert them to disk piezos because I use a bolt for my bridges. I thought this was dumb since they have a rod piezo attached. Can I treat the rod piezo like the disks and hot glue them to the inside of the box cover or neck.

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The rod piezzo needs direct pressure of the vibrating string to work - ie between the saddle and bridge,  with the saddle free to vibrate onto the rod.  That's what I've been able to find out.  I think that the rod might not be a sensitive as the disk?  I've had the same question, and maybe I'll get around to experimenting with one soon.

thanks scott

Rod piezos need direct downward pressure from the bridge. Try a littl experiment: make yourself a wooden bridge, and set it directly atop the rod piezo (you may need t carve a small channel into the base of the bridge for the rod to fit into). It will work.

thanks ron

What do you use to keep the bolt from rolling and messing up the intonation when tuning?

Its a bolt and nut at the bridge. I have several sizes to get the action right. I also use a 3/8 x1-1/2  bolt as the nut set in a small indentation. The movement of these allows easy conversion from a low action to a higher action if one wants to play more slide guitar. Intonation doesn't seem to be a problem. Plus the thing looks really cool.

ok, the hex head of the bolt and hex nut stop it from rolling.  I asked because I have stumbled across a few wall hangers that used a bit of threaded rod, and when I went to tune them I could watch the threaded rod roll toward the neck. 

Its become my new favorite curse word - "Wall Hanger!" LOL

I guess that my option. I was hoping to just glue it to the inside :-(

You keep doing that, you'll keep buying disc piezos. The way to make it work with a bolt is to

1) cut the bolt head off
2) Grind a flat into one side of the bolt
3) Carve a channel just barely big enough lengthwise into the flat so that the rid piezo fits inside it.

That's a lotta grinding and cutting.

A rod has maybe 30-50 square millimeters of piezo on it, a disk has somewhere around 2000 square millimeters of piezo.

That is how I did mine... first one was awesome. The second I decided to cut the piezo shorter... fail... next time I leave it long, up the one was awesome...

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