The yokes will slide off the tube after removing the 2 stainless steel clamps. The oil will only come out if you take the crt off the lense to get that cast alum. But there is a drain screw to get the oil out and a button like thing you push to pump out the oil. no need to break the tube. Best way to drain it is to get a big funnel and a milk carton, unscrew the drain screw and pump the button thing, after most of the oil drains, slowly remove the screws that hold the bulb to the alum, may need to pull them apart a bit and the rest of the oil will come flying out. thats were it gets messy.
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