I think there is enough room to just get a small driver in there.

Mark the hole, remove oven, pre-drill hole, replace oven and hand tighten.

I talked to the engineers at Gaggenau when this series first came out and they got that glazed look on their face.

You should try this out on a 30" double oven !

Dear antss, thank you for your kind advice. I'll try a smaller screwdriver. I do not have a double oven to try out, but instead a BS-250 and BO-270 installed in a column. The problem is common for both of them (although BO-270 is so heavy that it sits tightly in the cabinet even with one screw).

p.s. I tried to e-mail to Gaggenau engineers about this problem, but my letter was unfortunately forwarded to BSH's russian customer service. Gaggenau in Mordor treats you like a Mordorian, so I ended up asking at the US forum.

I don't have any installation advice, but for customer service, try the distributor. In California, Purcell-Murray are extremely helpful and have all the knowledge and support that BSH lacks.

According to the BS250 install manual and the service manual you only need one screw.

Strange. I thought the inset in Fig.3 of the installation manual shows two screws. Also, exactly two screws were supplied with the oven. And finally, the oven is slightly rotating around the first screw when its door is being opened.

Thank you, jakvis! I checked the installation instruction one more time. The screw indeed seems to be tightened only from the handle side, while at the hinge side a retaining plate should be installed. That is the problem. I did not install the retaining plate, and, which is worse, I even do not remember whether it was present in the installation set. May be it is lost now.:(

You only need one screw as the appliance is quite weighty. As with the ovens they are hinged so the only pressure is when you pull on the handle which is why you only need the one screw handle side.