When the origional 575w S-4
Leko came out it had some alignment keyways sticking up which needed to be
ground away to accept the cap of the 750w cap.
A week ago I was working on some
City Theatrical S-4 follow spot fixtures that never got upgraded and made the mistake (wifie yelled about in now being useless as a
pineapple now needing to replace) taking away both the four keyways and the coaxial alignment slots. Give me a break... been like ten years since the last time I did the upgrade and I was only helping more efficiently remove what one of her kids was in my area attempting to remove - already cut half way
thru the thing in her not telling him sufficient that he would understand what to remove of them keyways...
Remove in grinding down the four little keyways at four out of six points on a clock and leave alone the 3:00 and 9:00 wider ones.
Beyond that the only major difference between a 575w and 750w
fixture beyond the holes for the 750w lamp is in the
lamp cap to the
fixture. The 575w
fixture will be wired with 18ga. and the 750w
fixture is wired with 16ga
wire. At no
point unless the
wire feeding the
fixture is changed should you remove that pin on the lamp and even than that's bad practice to remove the little
roll pin on the lamp as you never know after that what
fixture such a lamp will show up in.
Can modify the body of the
fixture but often cheaper and easier to replace the entire cap assembly.
