The quality issues with that drop-in is a joke but even if it were assmbled right, I don't care for Solarforce drop-ins.
Of the two single-mode XM-Ls I have from Solarforce, one stopped working a month after arrival due to cracked soldering between the board and pill and the other one is hardly noticeably brighter than an UF R5 I happen to have.
It might be because of incorrect expectations on my part but the SST-50 I just received from them is so ho-hum that an UF XM-L can keep up with it on medium.
Love their hosts and really like their throwers.
notsomuchtheirdrop-insFoy