Update November 2025. I am still using this head for the Seestar S50 every night I have clear skies. I have no idea why anyone would spend significant amounts of money on equilateral wedges. This works perfectly for the Seestar S50 in EQ mode. It’s a fantastic match. The icing on the cake is adjustments are smooth as silk and when I need to lock it down, it’s not going anywhere. I had to go through several returns of other heads that were not a good match. It was worth it. Just get this one and you’ll be happy. (I’m a stickler when it comes to quality). I hope this saves you the guesswork!Using for a Seestar S50 in equilateral mode. No need for pricey wedges when this works perfect (due to the Seestar walking you thru adjustments live). Has the 1/4 to 3/8 adapter and all the adjustment knobs lock it into position without having to wrench on them. This has a band inside with the “fluid”. You can tell based on how the head rebounds (slowly) and only when nothing is mounted. Another plus for Seestar use is the knobs are lower than the plate.. so there are no clearance issues with the base of the Seestar. Been using nightly for 3 weeks and love it.