[Zbrafish] making gels for embryo injections

[Jonathan Schumacher]

Greetings,

In "The Zebrafish Book", I see a really nice description of a device
to hold zebrafish embryos during microinjection (pg. 5.2).  I'd like
to make gels using this plastic "slot maker", but don't know where to
find such a device.  I've been using standard vertical wells, but it
would be nice to have 1 vertical wall to rest the embryo against & 1
sloped wall to inject from.  Any idea where to purchase this "slot
maker"?

Kindest regards,

Jonathan