Ah ha !Konrad, bare they wouldn't fit either way through the nozzle of the 24/40 D15T when I tried, but they will fit though the E28T and F39T nozzles, bare or dipped. I can't recall if I tried one with the nozzle of an 18/20 reload or simply assumed it wouldn't fit based on experience with the D15. I acquired two packs of the discontinued 18/20 E27T yesterday, and I'm very curious whether the MJGs will fit.
As it happens, you helped me load BKNO3-dipped MJG BP starters into four E28s last weekend.
So I have seen the MJG BP ignitors !
I was wondering if I could avoid winding and dipping my own with nichrome and solid cat-6 and Quick Dip ...
Thanks for the info @bad_idea !
-- kjh