I just use a couple wood blocks

 

And here I am hoping my bike doesn't fall while balancing on a regular trolley jack eeek

 

I used folded cardboard when I needed to jack up my bike. It was easy to modify if I needed a different size just by adding another fold or two. Plus it was free and easy to source.

 

They worked well enough, but after a few uses they became unstable, wanted to twist and fall over, and eventually they fell apart.

 

If you want a jack that will be able to jack your Dyna up and have it be rock solid - there's only one choice. The J&S Jack. URL; https://jsjacks.com/product/motorcycle-lift/
Nothing else even comes close. I bought mine about 5 years ago for $495. I just save $25 each week until I could afford it. I use it all the time for maintenance and for cleaning the bike (which is easier when elevated).
All the other jacks are crap and so are those Harley adapters - I tried them and they are unsafe.

Richard

 

^ Agreed.

 

I modified my cheap HF jack for about $10.

 

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agree 100%.

here below is a pic from 12 years ago (the adapters separating) before I got my J&S.
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Another vote for the J&S Jack. I know it's going to hurt, but just looking at Mud's picture should be more than enough reason to spend that kind of money on a jack. I was lucky and picked up one from a forum member that was a few hours away for pennies on the dollar. Bike is rock solid while up in the air.

 

I just use three 2x4 blocks...run the weight across the grain( 90 degrees or perpendicular) if you are worried about the wood splitting. I have HF grey/silver jack. I also use a tie down or twou just to stabilize the bike,also if I am going to leave it on the lift for a day or three.( and I have, but its funny when you are at work wondering if you will find your bike laying over when you get home,so far I havent...)