We have a very similar optical tube in our observatory. (UNENTAS).
Ours is on its original fork and serves the club well.
I looked at the mirror lock mechanism on our some time ago but from what I could find out, it is only for transport and not used when actually using the scope. The screws only reach when the mirror is wound fully back.
It is a beast to man handle and really needs 2 people to aim it and then reach the locks. We now have an argo navis on it and this has helped.
I see yours is on an EQ6. This would be pushing the EQ6 pretty hard as the OTA is pretty heavy.
good luck with making it work.
The view of saturn through ours is magical and galaxies are lovely and bright.
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