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Old     (worththewake)      Join Date: Nov 2006       01-27-2010, 5:02 PM Reply   
I need to drill a bigger hole to run more speaker wire in my tower. I currently have a titan tower on a malibu. What kind of drill bit am I looking for? I'm also looking for gromets (sp?) for the holes to protect the wire...any suggestions there? While I'm at it, anybody have suggestions on quick disconnects for the wire coming out of the tower before it enters the boat?
Old     (wakebrdjay)      Join Date: Apr 2008       01-27-2010, 9:06 PM Reply   
If the tower is stainless steel you will need a cobalt drill bit.
Old     (liquiddiet)      Join Date: Feb 2009       01-28-2010, 6:16 AM Reply   
You need a step bit like this:


grommets are the hard part, my tower was too thick for traditional grommets used for sheet metal and i had a hard time finding anything to work. I ended up finding funky faucet stop/grommets in the plumbing section and had make my own hole in the middle for the wires. They worked out pretty good, but they were a PITA to fit.


(Message edited by liquiddiet on January 28, 2010)
Old     (dhcomp)      Join Date: Jun 2003       01-28-2010, 10:00 AM Reply   
I'd use hard plastic grommets, they will work better than sheet metal gromets.
I actually think i used the same thing as above, small plastic hole plug, drilled out
Old     (camassanger)      Join Date: Oct 2009       01-28-2010, 10:07 AM Reply   
Where can I get some? I'm doin the same thing.
Old     (wakebrdjay)      Join Date: Apr 2008       01-28-2010, 11:32 AM Reply   
I have done installs on my Pro Flight aluminum tower and on a Titan stainless steel tower.The aluminum tower was a breeze,had a new bit from machine shop supply store.I asked for advice at the store before I drilled the stainless steel.They said to use a cobalt bit,made for drilling s.s. and use cutting oil while drilling.I removed the tower and used a drill press and it was still extremely hard to drill the stainless.The Titan tower was on a 2009 SAN 230.
Old     (liveoz)      Join Date: May 2002       01-28-2010, 2:48 PM Reply   
I drilled my titan with a regular bit for metal but I had to use my Electric Drill. The 18V drill could not penetrate at all.
Old     (worththewake)      Join Date: Nov 2006       01-28-2010, 4:40 PM Reply   
thanks for the advice! I remember drilling the damn tower for the first time and it sucked big time.....picked up a cobalt bit...damn expensive
Old     (skongolf)      Join Date: Aug 2009       02-05-2010, 6:15 AM Reply   
What size step bit is that? I have to do my tower soon and not sure what size to get. All i have to do is run a 14 or 13 gauge 4 conductor wire for my speakers. Anny suggestions
Old     (skongolf)      Join Date: Aug 2009       02-05-2010, 4:26 PM Reply   
Anyone??? I want to try and drill it out this weekend.


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