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As expected, when the guaranteed cost is too high, not guaranteeing the upgrade is on average cheaper screw-wise, but this is not counting any potential equipment that may be lost and so may imply a higher screw cost.
As expected, when the guaranteed cost is too high, not guaranteeing the upgrade is on average cheaper screw-wise, but this is not counting any potential equipment that may be lost and so may imply a higher screw cost.
<tabber>
|-|base cost=
{| class="wikitable"
|-
!colspan="2"| base screw cost
|-
| guaranteed cost
| 1st time guaranteeing is worth it (in [[File:Icon Star.png]])
|}
|-|0=
{| class="wikitable"
|-
!colspan="2"| 1
|-
| 0
| 1st [[File:Icon Star.png]]
|-
| 1+
| Never
|}
|-|1=
{| class="wikitable"
|-
!colspan="2"| 1
|-
| 1
| 1st [[File:Icon Star.png]]
|-
| 2+
| Never
|}
|-|2=
{| class="wikitable"
|-
!colspan="2"| 2
|-
| 2
| 1st [[File:Icon Star.png]]
|-
| 3
| [[File:Icon Imp.png]]
|-
| 4+
| Never
|}
|-|3=
{| class="wikitable"
|-
!colspan="2"| 3
|-
| 3
| 1st [[File:Icon Star.png]]
|-
| 4
| 8th [[File:Icon Star.png]]
|-
| 5+
| Never
|}
|-|4=
{| class="wikitable"
|-
!colspan="2"| 4
|-
| 4
| 1st [[File:Icon Star.png]]
|-
| 5
| 8th [[File:Icon Star.png]]
|-
| 6
| [[File:Icon Imp.png]]
|-
| 7+
| Never
|}
|-|5=
{| class="wikitable"
|-
!colspan="2"| 5
|-
| 5
| 1st [[File:Icon Star.png]]
|-
| 6
| 7th [[File:Icon Star.png]]
|-
| 7
| 9th [[File:Icon Star.png]]
|-
| 8
| [[File:Icon Imp.png]]
|-
| 9+
| Never
|}
|-|6=
{| class="wikitable"
|-
!colspan="2"| 6
|-
| 6
| 1st [[File:Icon Star.png]]
|-
| 7
| 7th [[File:Icon Star.png]]
|-
| 8
| 9th [[File:Icon Star.png]]
|-
| 9
| [[File:Icon Imp.png]]
|-
| 10+
| Never
|}
|-|7=
|-|8=
|-|9=
|-|10=
|-|11=
|-|12=
|-|13=
|-|14=
|-|15=
|-|16+=
There is only one equipment with a base brut screw cost above 15 (the [[SK Radar]]), and as every equipment consuming expensive "Akashi exclusive" or rare equipment, the average screw cost is less important that the raw cost, meaning that guaranteeing the upgrade is always worth it
</tabber>