Should you spend the money.....No
Do not me afraid of doing this. I do not have bent wrenches
and still do it in about 1 hr. If you have the MB tool kit, you have a wrench to get on the bottom nut. A standard size wrench will work for the top. Here is a link that will walk you through it. NO PROBLEM.

http://www.dieselgiant.com/valveadjustment.htm

good luck and let us know how it goes.....you can do this.
When I did my first one, I was so motivated with how easy it was, I did
my other 300D as well......2 in one day.

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81 Mercedes 300SD 289k.......SOLD
82 Mercedes 300CD 252k......slow ride

82 mercedes 300 SD...mi Unknown
83 Mercedes 300D ????ksniff..gone too
84 Mercedes 300D 148k........SOLD
85 Mercedes 300TD 386k and holding some one elses project