I just opened one that came with the Mastertronic to try and got 78.10mm so there seems to be a bit of a variation even in the OEM needles.
I think shorter is less of a problem than longer. With shorter, you'd need to refill more often, with longer you could have crashes.
I don't have needles from Coralvue as I'm holding my purchase to get yours at a more reasonable price.
I hope the length situation doesn't cause a major delay and you can start selling them before people run out of them and face he need to get the ones from CoralVue.
Hopefully you can recover the initial investment soon and can bring the price down to $1 per needle. I think that would be a really sweet spot.
I'd be happy to try the longer ones you got to see if there is enough clearance in my MT. I'm guessing there is also some variation on the Mastertronic side.
I think shorter is less of a problem than longer. With shorter, you'd need to refill more often, with longer you could have crashes.
I don't have needles from Coralvue as I'm holding my purchase to get yours at a more reasonable price.
I hope the length situation doesn't cause a major delay and you can start selling them before people run out of them and face he need to get the ones from CoralVue.
Hopefully you can recover the initial investment soon and can bring the price down to $1 per needle. I think that would be a really sweet spot.
I'd be happy to try the longer ones you got to see if there is enough clearance in my MT. I'm guessing there is also some variation on the Mastertronic side.