does this look right to you
there's a line whenever (! (cnt % 68))
1st column is the absolute count
2nd column is a running count is the cnt that's reset each complete rotation
3rd is the adjust offset reduced by 1.0 when >= 1.0
4th column indicates when the extra adjustment is made
68 68 0.000 barrel
136 136 0.000 barrel
204 204 0.000 barrel
272 272 0.000 barrel
340 340 0.000 barrel
408 408 0.000 barrel
476 68 0.168 barrel
544 136 0.168 barrel
612 204 0.168 barrel
680 272 0.168 barrel
748 340 0.168 barrel
816 408 0.168 barrel
884 68 0.336 barrel
952 136 0.336 barrel
1020 204 0.336 barrel
1088 272 0.336 barrel
1156 340 0.336 barrel
1224 408 0.336 barrel
1292 68 0.504 barrel
1360 136 0.504 barrel
1428 204 0.504 barrel
1496 272 0.504 barrel
1564 340 0.504 barrel
1632 408 0.504 barrel
1700 68 0.672 barrel
1768 136 0.672 barrel
1836 204 0.672 barrel
1904 272 0.672 barrel
1972 340 0.672 barrel
2040 408 0.672 barrel
2108 68 0.840 barrel
2176 136 0.840 barrel
2244 204 0.840 barrel
2312 272 0.840 barrel
2380 340 0.840 barrel
2448 408 0.840 barrel
2449 0 0.008 * barrel
2517 68 0.008 barrel
2585 136 0.008 barrel
2653 204 0.008 barrel
2721 272 0.008 barrel
2789 340 0.008 barrel
2857 408 0.008 barrel
2925 68 0.176 barrel
2993 136 0.176 barrel
3061 204 0.176 barrel
3129 272 0.176 barrel
3197 340 0.176 barrel
3265 408 0.176 barrel
3333 68 0.344 barrel
3401 136 0.344 barrel
3469 204 0.344 barrel
3537 272 0.344 barrel
3605 340 0.344 barrel
3673 408 0.344 barrel
3741 68 0.512 barrel
3809 136 0.512 barrel
3877 204 0.512 barrel
3945 272 0.512 barrel
4013 340 0.512 barrel
4081 408 0.512 barrel
4149 68 0.680 barrel
4217 136 0.680 barrel
4285 204 0.680 barrel
4353 272 0.680 barrel
4421 340 0.680 barrel
4489 408 0.680 barrel
4557 68 0.848 barrel
4625 136 0.848 barrel
4693 204 0.848 barrel
4761 272 0.848 barrel
4829 340 0.848 barrel
4897 408 0.848 barrel
4898 0 0.016 * barrel
4966 68 0.016 barrel