They are within tolerance. Not unusual to have some + and – variances. This is the reason I always suggest, for a precise build, that heads are weighed so you will know what you need to do to create a consistent build. I prefer to dry fit all the components and then adjust the weight I will need to achieve a consistent swing weight. This way takes all the component parts into account, because all parts have tolerances as well. A perfect 7 grams progression may not always get you exactly the swing weight you want when all the other components are considered. You can go ahead and try to get a more consistent progression, but from an overall build standpoint, doing it by dry fitting all the components will yield a more consistent build. Doing it this way will make the head weight progression more consistent, even though, if you just consider the heads, they may not be exactly 7 grams apart.
Brass or lead tip weights does not matter. Either will work. Do take into account the how the tip weights affect the length so you can account for it. Once you get all the parts together, having made the adjustments necessary, and the swing weights are all consistent (+-.5 points is a tight tolerance), the frequency progression should be consistent, or as consistent as the shafts themselves are. Shaft tolerances can affect how the flex progression ends up, but you should still see a decent progression. You can waste a lot of time trying to get swing weights and frequency progressions perfect, and the fact is slight variances do not matter and are of no consequence with regards to performance or playability.
Hope this helps. Let us know how the build goes.
Britt Lindsey
Thanks, Britt – will do. My final pre-build test (length) has been delayed by a few days of MUCH needed rain in Central Texas.