Vacum Modulator Replacement 92 300E

[W124300E]

I took out the old vacuum modulator on the tranny on my 1992 Mercedes 300E 2.6. It was very difficult to take it out and I had to apply allot of pressure. Now, I cannot install the new one as it looks like it barely fits. Overtime I try I do not have the strength to do it. Is there a method of installing it? Any helps appreciated, Ive been working on this for several days now and just cant install it. Thank you!