I've used the J&S on my F6B without the adapter; no issues from what I could see.
The J&S has two rubberized strips on top of the two support arms and the adapter simply looks like it stacks up a few extra layers to bridge around the oil sump. When I had my bike up on the lift I didn't detect any high-load points or instability without the adapter but if it really bothered you a couple strips of hard rubber garage door gasket material could easily suffice.
Note that the J&S uses the center stand as a lift point, so you need to lift from the side-stand. But, be forewarned, if you have a lowering link on the bike you may need to roll the bike onto some 1x6 boards to get addition clearance unless you have a helper who can stand the bike up.
To all that responded thanks. To you guys with these jacks I feel better about my decision. Does the jack come with proper lift point information for our bike? Also for everyone who says but a McIver belly pan and lift using it I have read several claiming you can damage the bike doing that. Any comment? I want to have everything straight when I order this. Thanks. F6Broy
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