diff --git a/src/gradients/pulsed_gradients.jl b/src/gradients/pulsed_gradients.jl
index c73712c76016acefebf9f1e0b11f044543ae51ca..08f7f8114af396a29c6b64a9996226d29beccc52 100644
--- a/src/gradients/pulsed_gradients.jl
+++ b/src/gradients/pulsed_gradients.jl
@@ -116,7 +116,7 @@ end
 properties(::Type{<:PulsedGradient}) = [qval, δ, gradient_strength, duration, rise_time, flat_time, slew_rate]
 
 
-function to_concrete_block(builder::SequenceBuilder, block::PulsedGradient)
+function to_concrete_block(block::PulsedGradient)
     if block.orientation == :bvec
         rotate = true
         qvec = [value(qval(block)), 0., 0.]
@@ -132,7 +132,7 @@ function to_concrete_block(builder::SequenceBuilder, block::PulsedGradient)
     t_start = value(start_time(block))
     t_rise = value(rise_time(block))
     t_d = value(δ(block))
-    return ConcreteBlock(builder, t_start + t_d + t_rise, gradients=[
+    return ConcreteBlock(t_start + t_d + t_rise, gradients=[
         (t_start, zeros(3)),
         (t_start + t_rise, qvec),
         (t_start + t_d, qvec),
diff --git a/src/pulses/constant_pulses.jl b/src/pulses/constant_pulses.jl
index e0e947cb334987eb8a71bbd27514f381f24d2de0..1468e45f5d008740f8b50a94cd166f19a6020a35 100644
--- a/src/pulses/constant_pulses.jl
+++ b/src/pulses/constant_pulses.jl
@@ -49,10 +49,10 @@ bandwidth(pulse::ConstantPulse) = 3.79098854 / duration(pulse)
 
 properties(::Type{<:ConstantPulse}) = [amplitude, duration, phase, frequency, flip_angle, bandwidth]
 
-function to_concrete_block(builder::SequenceBuilder, block::ConstantPulse)
+function to_concrete_block(block::ConstantPulse)
     d = value(duration(block))
     final_phase = value(phase(block)) + d * value(frequency(block)) * 360
-    return ConcreteBlock(builder, value(duration(block)), pulse=[
+    return ConcreteBlock(value(duration(block)), pulse=[
         ([0., d]),
         value.([amplitude(block), amplitude(block)]),
         value.([phase(block), final_phase])
diff --git a/src/pulses/sinc_pulses.jl b/src/pulses/sinc_pulses.jl
index 3f2062ad0987a42238223f28422c2792a5d5e474..dcdce060641a358135f0b5e5dee31c3de940535d 100644
--- a/src/pulses/sinc_pulses.jl
+++ b/src/pulses/sinc_pulses.jl
@@ -100,13 +100,13 @@ lobe_duration(pulse::SincPulse) = pulse.lobe_duration
 bandwidth(pulse::SincPulse) = 1 / lobe_duration(pulse)
 properties(::Type{<:SincPulse}) = [amplitude, N_left, N_right, duration, phase, frequency, flip_angle, lobe_duration, bandwidth]
 
-function to_concrete_block(builder::SequenceBuilder, block::SincPulse)
+function to_concrete_block(block::SincPulse)
     normed_times = -value(N_left(block)):0.1:value(N_right(block)) + 1e-5
     times = ((normed_times .+ value(N_left(block))) .* value(lobe_duration(block)))
     amplitudes = value(amplitude(block)) .* (normalised_function.(normed_times; apodise=block.apodise))
     phases = (value(frequency(block)) .* value(lobe_duration(block))) .* normed_times * 360
     return ConcreteBlock(
-        builder, value(duration(block)); 
+        value(duration(block)); 
         pulse_amplitude=Shape(times, amplitudes), 
         pulse_phase=Shape(times, phases),
     )