You would be better off installing a simple 102" whip and saving a lot of money to boot! In that case, just don't
install a spring for 10 meters. No trimming necessary. I get an SWR of 1.2/1 for 10 and 11 meters without the spring. If you want to use the antenna for 10, 11 and 12 meters, install a good stainless steel spring to add 6" of length. Tuning is not critical for HF frequencies, so you will most likely enjoy 1.3/1 or lower SWR on all of the bands mentioned.
Your Wilson 5000 may work just fine on 10 meters and can still be used on 11 meters without any tuning. You can tune it between 10 and 11 meters for best average SWR, if you want. For 10 meters only, start by pushing the radiator all the way in and check the SWR as you pull it out in increments. Trimming the radiator should not
be necessary. I would go ahead and try that antenna first
, since you already have it. Read the review on eHam.net!
Another inexpensive option, if you want a shorter antenna, would be to get one of the 36" tall MFJ hamsticks for $19.95. The reports are that it performs as well as the 48" model. It can be used on 10 and 11 meters as well!