Hi Darren
I have a mewlon 180 on the way (visual only) , my second tak I've had a 6x30 finder on my dob for quite a few years
,tom says the 4 will carry it well because of how its weighted. I'm unsure whats the next step up from the 18, planet ? , that one looks a serious bit of wood and likely much more than i need,
I see the option at telescope express now Andy for a DM6, the 4 is still a 3/8" I believe ?