Related to this, you might be interested in a fairly thorough Wikipedia article on screw drive types, including the mind-boggling array of tamper-resistant ones: http://en.wikipedia.org/wiki/List_of_screw_drives

Note there are 2 triangular types, the TA triangle with straight sides, and the TP3 triangle with curved sides, in addition to the tri-wing triangular slotted heads.

On 02/12/2012 1:38 PM, Kevin McGregor wrote:

...Or I could try replacing some of the bulbs. I got it partly working again, briefly. When it was partly working, 1 in 3 bulbs on the 150-bulb string were on. No bulbs are missing, but the shunts on 2 or more of them may have failed. I hope somebody still stocks replacement bulbs for these. Wish me luck! And thanks for the tip; I'll check PA if it turns out I need the screwdriver.

On Sun, Dec 2, 2012 at 12:28 PM, Adam Thompson <athompso@athompso.net mailto:athompso@athompso.net> wrote:

Princess Auto sells several security-bit sets, I believe at least
two of them include the triangle bits.
-Adam



Kevin McGregor <kevin.a.mcgregor@gmail.com
<mailto:kevin.a.mcgregor@gmail.com>> wrote:

Does anyone have, or know where I can get, a small triangle-head
screwdriver? I have a long (150-bulb) Christmas tree light set
that doesn't work at all. It has a controller to make the lights
do different flashy things, and the controller seems to be held
together with two screws with triangle-shaped sockets. Not
Robertson, not Tor-x. The whole thing worked fine last year, and
I'd like to have it working again. I thought I would take it apart
to see if there was anything obviously wrong with it (check for
voltages, etc.).