valve spring compressor:

https://www.ebay.com/itm/Valve-Spring-Compressor-Lever-Type-OHV-OHC-Engine-Seal-Keeper-Tool-Kit-USA-Ship/402348593906?_trkparms=ispr%3D1&hash=item5dadd852f2:g:3S0AAOSwDi5fJ61u&enc=AQAFAAACcBaobrjLl8XobRIiIML1V4Imu%2Fn%2BzU5L90Z278x5ickkTboA95HSvGa1O5UmCCGJLpNqEwIKMsDujlM1JMpE slJ%2FsEl0neiUj3pf35pc44XihO%2FlIE3%2BYdz8MmajZtplO588TWp9y%2BveCZGboy%2BYjWJy80g5WpkFGlWY4beDRkdP1k WaICshbL8oAbdrzlOwVPQ1Bis6AG6wyGjUpesjfQuB6L%2FENRloT3DPgeAyXnXU1uc2gzq7rSd2m1m%2BCvMkWqpaFrik3dW9xF GxEBXy6ltfYG8PdX8sTtZ20jeYLrSieZw877lw5ECZYkp8WCmht28fsOcYems0a2y67VSIsVjqKUyvSFf0d34%2BjDVf%2BcW0JN r5sq9DujjcOnmu%2Bs0xSxdoK%2B2RgvpB%2B4zfXG5OUL2%2FJLE0iAFt3DnjTZOEOscBz4mIIJHs7GIeLQVSNqGdqpT%2BZNmC ycduNLc9uyMMw5jlmn5HG5ghaWWIn260C080%2FzXbr7gZuBPTHscjkOa3snZUJn2S8t6LyrgSy80yaa0UPgi58CoowgGgPtcEpd 9%2BetjaHzLpImf84VlIsgfIPTrEYLDyilMloTCrX27n6n3yIe2gTLWaWoN4s1OmbQI6UNT9GKjemYcRJOG9LLV7kYYBR7Gbxp5k UiIWu%2F0t1ZR%2FymIBx9bvHhejR01uSRJ4eT94YlKjsQtkWc0D%2BfrqE50gF0jttDzoNKNs84FNJv43ZZ2Q2C0P9vZkNu2Q%2 FWXt37e5Jk25SBne1h6mj93mRLXiO1woWIFp5bvl3OsxWWg3dUsFuCX73Qd4xKayhjVemv%2F12nAjCCYAnrQRoYR5GA%3D%3D&checksum=4023485939061ae2b27168b344cf908935bdbb26cb8f

you will have to modify it like this:

https://www.benzworld.org/threads/diy-m110-valve-spring-compressor.3036907/

both the tensioner and the head bolts are reusable refer to the factory service manual here for more info:

https://www.startekinfo.com/StarTek/outside/12265/?requestedDocId=12265

Also M110 uses a drain tube to drain the oil from the back of the cylinder head down into the front of the oil pan. I recommend replacing it.