Doug: The problem with [us] using the MoFi sleeves is that the MoFi sleeves were originally designed for use with a cardboard inner sleeve. This cardboard sleeve allows the record in the thin HDPE sleeve to be inserted into the jacket cover vis a vis the MoFi releases, without the fold over effect commonly seen with all HDPE sleeves (though the sleeves that Music Matter Jazz reissues have switched to are better-though don't know if they're commercially available-and one might have some other reservations).
Plenty of practice, believe me :) In fact, maybe way too much :)
One thing to remember: not all record jackets are cut the same size. Consequently, it's not always possible to smoothly slide the HDPE/LP combo into the jacket without the corner folding over.
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