BUGA Community

Hi
I have had my Beddie Cf 75' for about 3 months now, very happy. I'm 21, not a mechanic, but relatively capable with some fixes, and keen to repair most Beddie jobs myself.
I found the van pulling slightly to the left when braking, took the rear drums off and found a slow leak onto one of the left shoes.
It seems to be coming from the centre below the axle/spindle, definitely not brake fluid I think. Not losing fluid. I'm guessing it's a rear axle seal??

Is this a common issue? I have the Beddie manual and will investigate but I thought I would throw it at you guys first as this forum seems unreal, pic attached [the photo is turned 90 degrees anti-clockwise, the shiny bit above the springs in the center is actually small amount of fluid. There is a build up of crud at the base of the drum (but right on the photo)]

I'll replace with new drums both sides, and get someone to check the job for safety but first off;

Has anyone got some hints or words of advice for axle seal replacement? and do I need a special tool to get the center cap/nut off.
Any help appreciated, cheers, Tom