If you feel that you can get through a season with 10 sets...
If you feel that you can get through a season with 10 sets of parts, but you make 20 just in case, that's wasteful - but if you make 12, that's a small insurance policy.
If you feel that you can get through a season with 10 sets of parts, but you make 20 just in case, that's wasteful - but if you make 12, that's a small insurance policy.