What i use here is a bottle holder and the thickest hair rubber i could find on a store nearby.
So here's the test result with foot thumps on the floor. Picture on the left is using the mic's stock holder, and on the right with DIY shockmount attached.
Looking at it's ugly appearance, i should be happy with the result!
Another thing: Every microphone differs in weight, so a common hair rubber might not work with heavier mics than this TLM 102. You'll need a stronger, thicker one.
Sorry for not documenting the whole steps, too lazy i guess. But hey, you should get the idea.
Happy DIY!