Raising waffle trays

[Jason]

What do people use to prop trays up to the right height?
I don't have space to put the tray on the build bed so I'm
looking at putting it in a spare feeder area so it will need
a "brick" of something under it.

I assume a bit of double sided tape to keep in place?

[Gopher]

I used to have  nice rigid plank of trailerboard with legs as spacers. On the top I had some nylon fittings that held the tray square. This tray fitted down the side of the place area, IIRC the machine would reach about just over half of it. I think I stuck the spacers down with something. Trays in the place area I did used to hold in place with tape, but you could equally stick magnetic tape on the bottom tray as with my current solution below (albeit not on an RV).
Another solution I currently use is to tightly glue a stack of empty waffle trays together, on the bottom I have adhesive magnetic strip and the top layer is one of those blank waffle "tops" this means any waffle tray I put on this stack will always lock into place regardless of its matrix size. This would need a little adjustment to fit in an RV because of the lip between the MDF surface and the plate the feeders lock into, perhaps some  magnetic strip on the side instead and something to keep it level.

[Alex]

Hi I used 4" x 2" block of wood on it's side, beside the PCB platform with an empty Waffle tray screwed to this and then the full one on top. At this height the Waffle tray would hover above the platform and therefore any vibration from the rotating arm would not cause a problem to fine pitch device picking. I placed 1000s of .5mm pitch QFPs using this method.