John Trefz Guitars & Pianos Menu
    John Trefz
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    • About John
    • Tuning by Rose

    Norwood, Delaware County, PA. Outside Philadelphia.(Map) 610.945.7326

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    Guitar Setup and Repair Services

    basses, mandolins, and similar instruments too!

    • Adjustments to neck and bridge height to guitars
    • Repairs to instrument/body damage
    • Damaged fret restoration
    • Routing a guitar bridge to correct action height
    • Upright bass repair
    • Bone saddle replacement
    • Replacement polished bone nuts
    • Finish Repairs
    • Structural Repairs

    Learn More and see Photos from the shop

    Dave A.
    2017, between a friend of mine and me, we’ve taken 10 guitars and bass to John. His work is exemplary. Very dedicated to his craft, and very eager to teach.

    Tony G.
    2017, John is extremely dedicated to his craft. He knows all there is to know. He does outstanding work. Highly recommended!

    Jordan R.
    2017, Hands-down the best. I’ll never take my guitars anywhere else.

    Paul B., Salem NJ
    My Larrivée Guitar is a totally different guitar; you improved the sound so incredibly that I'm really kind of stunned and saddened that it had all that untapped potential for the 40+ years I've owned it. Now that I've really laid back and played it I'm speechless.

    Also, with both the Loar and the Larrivee, I thought that I was losing my strength in my wrist due to old age or whatever, but now I realize that both those instruments were just hard to play. They looked ok, and what did I know? I had the Larivee worked on by other techs and thought that was as good as it gets; boy was I wrong. They both play like butter and I'm trying to find the time to enjoy these instruments. Thanks so much. Again, the sound of that Larivee...like a dream come true.

    Piano Parts Duplication

    We specialize in creating custom replacement piano bridges, and pinblocks

    We can custom duplicate treble and bass bridges, uppernuts, pinblocks, damper guide rails, and wood action rails.

    Trefz has duplicated thousands of piano bridges, from spinets to concert grands. Piano pinblocks duplicated, including Chickering multi-piece pinblocks.

    Learn more about custom replacement piano bridges and pinblocks

    © 2025 John Trefz Guitars and Pianos

    202 South Ave.
    Norwood, PA 19074
    610.945.7326
    Map

    Aston 19014, Broomall 19008, Chadds Ford 19317, Concordville 19342, Drexel Hill 19026, Folsom 19033, Garnet Valley 19060, Glenolden 19036, Glen Riddle 19037, Havertown 19083, Holmes 19043, Manoa 19083, Marple 19008, Media 19065, Middletown, Morton 19070, Nether Providence, Norwood 19074, Prospect Park 19076, Radnor 19087, Ridley, Ridley Park 19078, Rose Valley 19063, Secane 19018, Springfield 19064, Swarthmore 19081, Upper Providence 19063, Wallingford 19086