Plunge depth less than 12mm

[iamnothim]

Today I was installing a veneer shelf to a wall using a cleat made of 5/4 material.  The shelf is veneer on 1/2” Medex.
I was going to use 5mm x 28mm dominos between the shelf and the cleat until I discovered the minimum plunge depth is 12mm.  I did the math again and I caught myself just before I was to plunge through the top of the shelf.

I switched to the 4mm bit and used the small dominos and the project went well.  I notice the 4mm bit is half as long as the others....

Q: Are there shorter 5mm bits?  or Is there a way to limit the plunge depth below 12mm?

Thanks

 

[Stoli]

RTFsM, page 19

http://www.festoolusa.com/media/pdf/domino_df_500.pdf

 

[iamnothim]

RTFsM, page 19

http://www.festoolusa.com/media/pdf/domino_df_500.pdf

Thanks,

I missed that. [embarassed]
I only looked a page 9 and figured the other sections were for complex issues like miters.
I am not going to use 1/2" PVC from a hardware store on a $1,000 precision machine.
I'll look at McMaster Carr for some proper nylon ones.

 

[mouppe]

You can also use double-sided tape to stick a shim to the front of your workpiece, and mortise through it to the workpiece beyond. Then either use a hand saw and reduce the length of the dominoes, or compensate by mortising deeper on the mating workpiece.