replacement single arm operator for casement window

Question

I am looking for replacement for Truth 45034LH... (3x)

part 39028(left side crank) looks like exact replacement, is it available?

I also looked at Ellipse 39-027E which has same measurements...

Then saw Offset39-412, which also has correct measurements.

Which is right for me? What is the difference between Ellipse and Offset?

Thank you,
Laura

Tom · Accepted Answer

Thanks for posting, Laura. I'm not sure what you need, exactly. The 39-027E operator has a straight arm, while the 39-412 operator has a bent, or "offset," arm. Both operators are technically "ellipse," that's just the rounded style of the base. You don't need to worry about that, the only important difference between them is the arm.

Assuming your dimensions are the same, then you just need to determine if your arm is straight or offset.