Need to Fill and Redrill Frameless Shower Door Mounting Holes

Discussion in 'Shower & Bathtub Forum & Blog' started by jkmason, Nov 4, 2011.

  1. jkmason

    jkmason New Member

    Messages:
    13
    Location:
    Minnesota
    Good morning, I'm in the process of mounting a frameless glass shower door. First attempt was off by about 1/8".

    My mounting holes are 5/16" wide (4 per mounting bracket) and drilled through 1/2" beige travertine. The holes will be hidden behind the mounting bracket.

    I picked up a scrap piece of travertine and drilled a couple of 5/16" holes to practice filling and redrilling.

    My first attempt was to fill with Bondo. After the product set, I drilled another adjacent hole, but the drill bit just slid into the softer Bondo.

    What would be a good product to use in this situation?
  2. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    4,052
    Location:
    NW Ontario, Canada
    What I've done in the past was to use some stainless steel wool and epoxy to fill the hole. Then, to keep the drill from walking sideways, I use a dremel tool to start the hole or a wood block as a guide hot glued to the tile or stone.
  3. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    One idea would be to drill a small hole..say 1/8" ...at the new location, then use a Roto with a sprial bit to "worry" that hole big enough for your anchor or bolt.
  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,132
    Location:
    New England
    A diamond core bit has no center point - it's essentially a piece of pipe with diamond dust on the end...it probably wouldn't walk. What's the finish on the door? Could you just make the hole a little bigger? A rotary device like a RotoZip with a carbide bit could probably make the hole bigger fairly easily...travertine isn't all that hard.
  5. jkmason

    jkmason New Member

    Messages:
    13
    Location:
    Minnesota
    Thanks everyone for the advice and all the great ideas. I love the idea of mixing in the stainless steel wool. That got me to thinking. I decided to mix up some crushed travertine (1/8" average size) along with the bondo. I'm working on a test hole to see how it drills. I'm also going to try the stainless steel wool idea.

    I tried the diamond core bit, but really had trouble getting it to stay in one place. Right now I'm using glass/tile bits. I'm going to start out with an 1/8" bit and then move onto my 5/16" bit. I'll let you know how it goes. This HEAVY frameless shower door leaves no room for error or adjustment so I need to drill very accurate holes.
  6. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    22,132
    Location:
    New England
    The magic on using a core bit is to start it at about a 45-degree angle, get an edge divot, then slowly bring it up so it's vertical. This keeps it from walking around. Another way is to drill a hole through something, double-stick tape it in place, then use it as a guide. If you don't keep it wet, you'll wear it out, though.
  7. jkmason

    jkmason New Member

    Messages:
    13
    Location:
    Minnesota
    Hey Jim, since I have the bit I'll try your technique and make sure to keep the bit wet. Thanks, Jack.
  8. jkmason

    jkmason New Member

    Messages:
    13
    Location:
    Minnesota
    Back again. Just tried redrilling the newly hardened mix of broken travertine chips and bondo. Worked like a charm. Drilled spot on with no wandering. Thanks everyone for the help. Jack
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