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@BevHevSteve
I note that you are proposing an interesting Oil Pump Entry Port Adapter made of improved metal pieces:
https://store.bevelheaven.com/Engine-Re ... t-Adapter/

On this occasion I just noticed that the grubscrew is missing under the crankcase of my 750 GT.
Maybe forgotten after the last oil change (not made by me) or fallen down on the road if not secured enough...
I would like to know what is the exact function of the grubscrew: is it to avoid rotation of the rubber receiving the end of the oil filter?
If missing, is there any risk that the rubber rotates and the oil flow to the pump is slowed down or stopped and should I stop riding my bike until a new grubscrew is installed?
Or may I consider that once installed after the last oil change the oil filter and rubber are sufficiently tightened in the right position?

Actually I already drove my bike beforehand without noting any issue and verifying through the glass window that oil comes up to the vertical head:

Sorry for my mistake, I checked closer, it was an optical artefact, the screw was well recessed!
I feel better haha.
I could not understand how oil would not have drained through that hole...

Still would like to understand how exactly the screw acts, if it secures the right orientation of the rubber or if it only tightens that rubber against the oil filter. Also if screwing is enough for leak tightness or if a seal is required.

I understand that the screw would act in a similar way on the replacing aluminium piece in the kit offered by Steve.

25 views and no reply?

I would like to understand in particular if I need to unscrew that "grubscrew" when, during my next oil replacement, I have to remove the oil filter for cleaning.

Looking at the parts catalog of the 750 GT it is not clear to me how exactly the oil filter (part 125 800 49.800), inserted from the LHD side of the crank case:
is secured in the facing rubber (part 275) introduced on the drain plug (part 110) on the LHD side of the crankcase:
Does this grubscrew (part 250) secure the orientation of the rubber and/or tighten the oil filter on the RHD side of the crankcase (in order to allow a full oil flow upstream through the oil pump)?

And is it necessary to secure the screw with blue Loctite or alike?

Please any answer appreciated

the grub screw locates into a hole in the rubber sleeve that the sump screen nestles into. You would never remove that grub screw unless the rubber sleeve falls apart and needs to be replaced. It also acts to make sure the rubber sleeve is oriented in the proper position so that oil can actually make it from the pump into the sump screen IOW rotate the rubber sleeve into the wrong position and no oil will pass through the sump screen. The grub screw is peened at the factory so it can not back out on its own.

Thank you very much, Steve.
That is what I thought but I was unsure about its required removal for oil change.
Now it's clear!