Discovered last night the pin on the istick is way shorter than the MVP's. I lifted the pin out fully from the body of the stick til I saw the attached wires and hadn't gotten it above the 510 well. I couldn't find purchase enough to hold the pin stable to get the oring on.
So I have an unusable blue istick. I was able to get the pin back into place. Going to try heading over to the local B&M, but never having been, I'm not sure if they'll be able/willing to help.
I'm a very sad vaper this morning.
I wouldn't give up so easily. I repaired mine last night with the O-Ring fix, so I know for a fact that it can be done, and I'm not technical or anything. It took me quite a while to get that center pin to come out far enough. I just worked it out with a small flathead screwdriver from an eyeglass repair kit. Eventually it it got to around the edge of the 510 threading, with the attached wire exposed. Then getting the O-ring on was a challenge, but I put half of the ring on, then grabbed it with some thin tweezers, while pushing the other end down with the screwdriver. Probably took me 20 minutes to complete the process.
You just need to go to to Lowes or Home Depot and grab Danco #60 O-Ring 10 pack for around $3. It can be done, and if you really think the istick is unusable, you really have nothing to lose by trying again.

when will it ever stop??? lol