I haven't found the 1763 entailment (if that's a word), but I did find Mary Stewart's will on Scotlandspeople.
Part 1 of 3
Testament testamentary umquhill Mrs Mary Stewart. 30 Dec 1774.
The testament testamentar and inventory of the debt and sum of money which was addebted resting and owing to the deceased Mrs Mary Stewart of Ascog at the time of her deceased upon the ____ day of ____ last made and given up by herself upon the ninth day of Nov 1773 in so far as concerns the nomination of her sole executor and now faithfully made and given up by Will Fullerton of Rosemont, George Fullerton of Bartinholm and John Bannatyne Commissary of Lanark in so far as concerns the inventory foresaid of the said defunct her debt and sum of money after written which Will and Geo Fullertons and John Bannantyne and the survivor of them the said Mrs Mary Stewart did nominate constitute and appoint to be her sole own universal legators and intromitters with her moveables means and affects and that by her disposition containing the foresaid nomination dated the said ninth of Novr 1773 registered in the sheriff courtbooks of Edr the seventh of Oct 1774 hereafter ingrost.
Follows the inventory.
In the first there was addebted and resting owning to the said defunct at the time of her decease aforesaid the sum of two hundred pounds of principal contained in a bond granted by William Scott of Wool Esq advocate and Charles Scott of Broad Meadows to Mrs Mary Stewart her heirs executors or assigns dated fifth and seventh days of December 1772. Item three hundred pound of principal contained in a bond granted by Andrew Plumber of Middleslead [?] Esq advocate to said Mrs Mary Stewart dated sixteenth July 1771. Item three hundred pounds of principal contained in a bond granted by Alexander Spiers, John Bowman, Will French [?] and Geo Crawford all merchants in Glasgow jointly and severally to the said Mrs Mary Stewart dated twenty fourth July 1771. Item five hundred points sterling of principal contained in a bond granted by Andrew Buchanan senior, Will Buchanan, Robt [?] Hastie, Walter Brack, John Jameson and ____ Jameson his son all merchants in Glasgow and Henry Galloway merchant in Stirling jointly and severally to said Mrs Mary Stewart dated the second and ninth days of Decr 1771. Item three hundred pounds sterling of principal contained in a bond granted by Andrew Cochran, John Bowman, Alexander Spiers, John Campbell, Thomas Ritor [?] William Boyle, Robt Boyle, Walter Montieth, Robert Marshall and James Ballantyne all merchants in Glasgow jointly and severally to said Mrs Mary Stewart dated second Dec 1772. Item four hundred pounds sterling of principal contained in a bond granted by John Vere [?] of Stonebyers [?] Esq, Will Weir Commissary of Hamilton and Campsie, Andrew Vere sheriff clerk of Lanark Shire and James Vere of Hawksland jointly and severally to said Mrs Mary Stewart dated eleventh twelfth and thirteenth days of Nov 1773 extending the debts and sums of money before written in haile [?] to two thousand pounds sterling which in Scots money is twenty four thousand pounds.
Summa of the debt resting to the dead …?