We need to purchase a seal for our estro (type sin 007) 120 v 60h2 950w

Since this calculator cannot perform symbolic manipulations (algebra) you never need to type in sin(theta) or cos(theta). To calculate the sine of an angle (whatever the name of the angle may be) just press the sin key followed by an angle value and the function will be calculated. same thing with any other trigonometric function.
Make sure that the angle units is set to the unit required by your calculation: degree, radian, or grad.

For example, type [sin(5*pi/2)]^2
See captured image

The FX-115ES is somewhat different to other calculators you might know. The sequence of keys is more like writing up a calculation in a textbook, whereas for "normal" calculators operations are reversed in some places.
For example, with most calculators you would type 30 [sin] to calculate the sine function of 30 degrees, with the 115ES its [sin] 30 [=].

The 115ES has all the standard trigonometric functions:

• Standard functions (sin, cos, tan), type the [sin], [cos] or [tan] key followed by the argument.
• Inverse trigonometric (sin?¹, cos?¹, tan?¹), type [SHIFT][sin], [SHIFT][cos] or [SHIFT][tan] followed by the argument.
• Hyperbolic functions (sinh, cosh, tanh), type [HYP][sin], [HYP][cos], or [HYP][tan] followed by the argument.
• and finally inverse hyperbolic (sinh?¹, cosh?¹, tanh?¹), its [SHIFT][HYP][sin], [SHIFT][HYP][cos], or [SHIFT][HYP][tan] followed by the argument.

Arguments can be given as numbers with mantissa (2.718), as fractions (use the fraction key below [CALC]) or as degree, minute, second (30°12'45") using the [°'"] key for input. To switch between degrees (1 circle = 360°), radians (1 circle = 2?), or grad (1 circle = 400 gon), use [SHIFT][DRG>].

Hi Some of the old Estros had Cosmic pumps and that was one of their problems. You can switch out the old Cosmic for a Ulka pump. There would be some modifications but not much.

Do you need the user's manual or circuit diagrams?

is there a diagram for the coffee holder. i took mine apart to clean it and i am not sure how the spring goes in.

I found the manual on yahoo thanks

Mine is a red O-ring about 2 1/4" diameter, the same as some automotive brake calipers. A well equipped mechanic or parts store like NAPA should have a supply of O-rings with the proper size, best to take your strainer in to test fit.

sin^2(x+2) is the same as (sin(x+2))^2

if you want to square sin(3), press:

(
sin
3
)
)
^
2