A product from Gel-Pak consist of small pads which are sticky on both sides.
These come in form of a sheet containing some 300 pads.
Remove a pad from the main sheet and put it on top of the vacuum chuck
used for small chips.
Then remove the top protective cover of the pad and attach your chip on it.
Now the chip is held by the stickiness instead of the vacuum, thus avoiding
resist going to the backside.
The vacuum pump must still be active for the spinner to work, there is a sensor
checking the vacuum.
There should be some sheets of this next to the spinner, if you cannot find it please contact the lab manager.
Idea by Anders Holmberg.