I was having the same problem with the seat lift on my Burg 400. I saw a thread on this forum about how to order & install a new lift that works much better than the OEM unit.
Unfortunately, with this redesigned site, I cannot find that thread. But I purchased my new lift from Lift Support Depot.com and installed it with the help of a friend. The total cost to me (including shipping & tax) was $25.79, and it was well worth it. No more need for dowels or clamps and the seat actually goes up by itself now.
The Code# was 10596E32 and the other number is 4142E32/10596E32 so that you order the lift with the correct 8mm eyelet fittings on the ends of the new hydraulic lift.
The lower nut can be tricky to remove & re-install so be extra careful with it. I suggest that you call them and make sure they know what it's for because they've now had several orders from our forum members.
I think the original post was by Jeff MDR on Jan14, 2012. Good luck!