building my rack

okay, im going to be trying to build my rack today, but as someone told me i could use these things as spacer, what do people use as spacers for heat tub? like how far apart.

not to sure but u should look or post this in DIY..

I used some 1/8" pieces of cheap trim. You could also use a scrap piece of thin melamine.

Most use CD's as spacers

Yep, blank CDs

alright thanks