I think the best way to make the 510 connector would be like I said long ago and it is to make an all brass or aluminum connector with a native 510 connection like the adapter looks like on the top of the connector, then have one or two laser holes at the bottom of the side walls, this would slow the liquid down enough that the 510 wouldn't flood and allow just the right amount in, it could be tested by starting off with one laser hole, then move to two and so on to see what works best. I have been testing with adapter and connectors for months now and this seem to work best, Rob since you have been the longest and best GG supplier I would like to here your opinion if that's possible or Cappy's