Here is the "tool" that I had made to install the oil seal. First start with governor base that is worn out and past its useful life. The one pictured below has had the machined surfeace where the weight carrier rides worn down in excess of 0.040"
Next, remove the oil baffle on the back of the governor base that would direct the oil inot the hole in the base/bushing. Just a couple of minutes with the bench grinder and then about 5-10 minutes with a file to clean it up. The baffle has been grond and filed flush to the back of the governor base. Removing the baffel will allow the "tool" to clear the ID of the new seal.
Next, using a 2" 5/8-11 bolt, 2 jam nuts, 1 washer and some permanent Loctite (red) and you have the tool assembled and ready to go.
The governor base is the correct diameter and it also has a lip on it it to stop it at the proper depth. The worn out governor base was already on hand and the bolt, washer and nuts cost $1.00, so all-in-all it is a relatively cheap and easy tool to make that works very well.