exhibit 10. 43 best energy services, inc 5433 westheimer suite 825 houston, texas 77056 december 14, 2009 mr. rick a. zimmer ms. donna zimmer 4410 weston drive fulshear, texas 77441 dear mr. zimmer ; this letter agreement ( the “ agreement ” ) will evidence the understanding of rick a zimmer as a participant ( “ participant ” ) and best energy services, inc. ( “ best ” ) with regard to participant ’ s participation in the east texas project known as the “ akin prospect ” currently being developed by best energy ventures, llc ( “ bev ” ), a wholly owned subsidiary of bes. the agreements and obligations of participant and best are set forth below. upon the execution of this agreement, participant shall pay best by check or wire transfer in immediately available funds the sum of $ 25, 000. best has received a short term assignment of the lease ( s ) comprising 100 % of the working interests in the akin prospect ( the “ term assignment ” ), which term assignment is attached hereto as exhibit a. this term assignment is an asset of bev. upon receipt of the $ 25, 000 by best, subject to the terms and conditions below, best shall : 1 ) grant participant a 5 year warrant to acquire 300, 000 shares of common stock of best at a strike price of $ 0. 25 per share ; provided, however, that in the event an equity offering by best is closed within the next 60 days ( the “ placement ” ), the warrant price will be reduced to the price used in such placement ( but no other adjustments will be made to the warrants ). the warrants will be evidenced by, and subject to, best ’ s standard form of warrant, which shall include appropriate investment representations. 1 ) 1 ) 2 ) grant participant a 6. 25 % membership interest in bev, a currently wholly owned subsidiary of best, which shall hold the term assignment of the akin prospect. 2 ) 2 ) 3 ) in addition, in the event that the akin prospect is not developed within the time frame sufficient to hold the lease stipulated in exhibit a, participant will be granted 250, 000 unregistered common shares in best. 3 ) 3 ) this agreement may be signed in counterparts and transmitted via facsimile and / or pdf and as such shall evidence concurrence by the executing party of the terms set forth herein.